50%

AtlasOS_SRS_v1.md

@@ -1,19 +1,20 @@
 SOFTWARE REQUIREMENTS SPECIFICATION (SRS)
-PlutoOS – Storage Controller Operating System (v1)
+AtlasOS – Storage Controller Operating System (v1)
 
 ==================================================
 
 1. INTRODUCTION
 --------------------------------------------------
 1.1 Purpose
-This document defines the functional and non-functional requirements for PlutoOS v1,
+This document defines the functional and non-functional requirements for AtlasOS v1,
 a storage controller operating system built on Linux with ZFS as the core storage engine.
 It serves as the authoritative reference for development scope, validation, and acceptance.
 
 1.2 Scope
-PlutoOS v1 provides:
+AtlasOS v1 provides:
 - ZFS pool, dataset, and ZVOL management
 - Storage services: SMB, NFS, iSCSI (ZVOL-backed)
+- Virtual Tape Library (VTL) with mhvtl for tape emulation
 - Automated snapshot management
 - Role-Based Access Control (RBAC) and audit logging
 - Web-based GUI and local TUI
@@ -36,7 +37,7 @@ Desired State : Configuration stored in DB and applied atomically to system
 
 2. SYSTEM OVERVIEW
 --------------------------------------------------
-PlutoOS consists of:
+AtlasOS consists of:
 - Base OS      : Minimal Linux (Ubuntu/Debian)
 - Data Plane  : ZFS and storage services
 - Control Plane: Go backend with HTMX-based UI
@@ -93,6 +94,18 @@ Viewer        : Read-only access
 - System SHALL configure initiator ACLs
 - System SHALL expose connection instructions
 
+4.6.1 Virtual Tape Library (VTL)
+- System SHALL manage mhvtl service (start, stop, restart)
+- System SHALL create and manage virtual tape libraries (media changers)
+- System SHALL create and manage virtual tape drives (LTO-5 through LTO-8)
+- System SHALL create and manage virtual tape cartridges
+- System SHALL support tape operations (load, eject, read, write)
+- System SHALL manage library_contents files for tape inventory
+- System SHALL validate drive ID conflicts to prevent device path collisions
+- System SHALL automatically restart mhvtl service after configuration changes
+- System SHALL support multiple vendors (IBM, HP, Quantum, Tandberg, Overland)
+- System SHALL enforce RBAC for VTL operations (Administrator and Operator only)
+
 4.7 Job Management
 - System SHALL execute long-running operations as jobs
 - System SHALL track job status and progress
@@ -161,7 +174,7 @@ Viewer        : Read-only access
 
 7. ACCEPTANCE CRITERIA (v1)
 --------------------------------------------------
-PlutoOS v1 is accepted when:
+AtlasOS v1 is accepted when:
 - ZFS pool, dataset, share, and LUN lifecycle works end-to-end
 - Snapshot policies are active and observable
 - RBAC and audit logging are enforced

README.md

@@ -5,6 +5,7 @@ AtlasOS is an appliance-style storage controller build by Adastra
 **v1 Focus**
 - ZFS storage engine
 - SMB / NFS / iSCSI (ZVOL)
+- Virtual Tape Library (VTL) with mhvtl
 - Auto snapshots (sanoid)
 - RBAC + audit
 - TUI (Bubble Tea) + Web GUI (HTMX)
@@ -30,3 +31,50 @@ sudo ./installer/install.sh --offline-bundle /path/to/atlas-bundle
 ```
 
 See `installer/README.md` and `docs/INSTALLATION.md` for detailed instructions.
+
+## Features
+
+### Storage Management
+- **ZFS**: Pool, dataset, and ZVOL management with health monitoring
+- **SMB/CIFS**: Windows file sharing with permission management
+- **NFS**: Network file sharing with client access control
+- **iSCSI**: Block storage with target and LUN management
+
+### Virtual Tape Library (VTL)
+- **Media Changers**: Create and manage virtual tape libraries
+- **Tape Drives**: Configure virtual drives (LTO-5 through LTO-8)
+- **Tape Cartridges**: Create and manage virtual tapes
+- **Tape Operations**: Load, eject, and manage tape media
+- **Multi-Vendor Support**: IBM, HP, Quantum, Tandberg, Overland
+- **Automatic Service Management**: Auto-restart mhvtl after configuration changes
+
+### Security & Access Control
+- **RBAC**: Role-based access control (Administrator, Operator, Viewer)
+- **Audit Logging**: Immutable audit trail for all operations
+- **Authentication**: JWT-based authentication
+
+### Monitoring
+- **Prometheus Metrics**: System and storage metrics
+- **Health Monitoring**: Pool health and capacity tracking
+- **Job Management**: Track long-running operations
+
+## Installation Directory
+
+Atlas is installed to `/opt/atlas` by default. The installer script will:
+1. Install all required dependencies (ZFS, SMB, NFS, iSCSI, mhvtl)
+2. Build Atlas binaries
+3. Set up systemd services
+4. Configure directories and permissions
+
+## Pushing Changes to Repository
+
+Use the provided script to commit and push changes:
+
+```bash
+./scripts/push-to-repo.sh "Your commit message"
+```
+
+Or skip version update:
+```bash
+./scripts/push-to-repo.sh "Your commit message" --skip-version
+```

installer/install.sh

@@ -440,6 +440,23 @@ install_dependencies() {
         }
     fi
     
+    # Install mhvtl (Virtual Tape Library) for VTL functionality
+    echo "  Installing mhvtl (Virtual Tape Library)..."
+    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq \
+        mhvtl \
+        mhvtl-utils \
+        mtx \
+        sg3-utils || {
+        echo -e "${YELLOW}Warning: mhvtl installation failed, VTL features may not be available${NC}"
+        echo "  You may need to install mhvtl manually or from source"
+    }
+    
+    # Create mhvtl directories if they don't exist
+    mkdir -p /etc/mhvtl
+    mkdir -p /opt/mhvtl
+    chown root:root /etc/mhvtl
+    chown root:root /opt/mhvtl
+    
     # Install databases (SQLite for compatibility, PostgreSQL as default)
     echo "  Installing database packages..."
     DEBIAN_FRONTEND=noninteractive apt-get install -y -qq \

internal/httpapp/router_helpers.go

@@ -1,11 +1,14 @@
 package httpapp
 
 import (
+	"fmt"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 
 	"gitea.avt.data-center.id/othman.suseno/atlas/internal/errors"
+	"gitea.avt.data-center.id/othman.suseno/atlas/internal/models"
 )
 
 // methodHandler routes requests based on HTTP method
@@ -85,8 +88,9 @@ func (a *App) handlePoolOps(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if strings.HasSuffix(r.URL.Path, "/scrub") {
+		storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 		if r.Method == http.MethodPost {
-			a.handleScrubPool(w, r)
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleScrubPool)).ServeHTTP(w, r)
 		} else if r.Method == http.MethodGet {
 			a.handleGetScrubStatus(w, r)
 		} else {
@@ -96,8 +100,9 @@ func (a *App) handlePoolOps(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if strings.HasSuffix(r.URL.Path, "/export") {
+		storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 		if r.Method == http.MethodPost {
-			a.handleExportPool(w, r)
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleExportPool)).ServeHTTP(w, r)
 		} else {
 			writeError(w, errors.NewAPIError(errors.ErrCodeBadRequest, "method not allowed", http.StatusMethodNotAllowed))
 		}
@@ -106,50 +111,67 @@ func (a *App) handlePoolOps(w http.ResponseWriter, r *http.Request) {
 
 	if strings.HasSuffix(r.URL.Path, "/spare") {
 		if r.Method == http.MethodPost {
-			a.handleAddSpareDisk(w, r)
+			storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleAddSpareDisk)).ServeHTTP(w, r)
 		} else {
 			writeError(w, errors.NewAPIError(errors.ErrCodeBadRequest, "method not allowed", http.StatusMethodNotAllowed))
 		}
 		return
 	}
 
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetPool(w, r) },
 		nil,
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeletePool(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeletePool)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
 
 // handleDatasetOps routes dataset operations by method
 func (a *App) handleDatasetOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetDataset(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateDataset(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
-		func(w http.ResponseWriter, r *http.Request) { a.handleUpdateDataset(w, r) },
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateDataset)).ServeHTTP(w, r)
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteDataset(w, r) },
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleUpdateDataset)).ServeHTTP(w, r)
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteDataset)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
 
 // handleZVOLOps routes ZVOL operations by method
 func (a *App) handleZVOLOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetZVOL(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateZVOL(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateZVOL)).ServeHTTP(w, r)
+		},
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteZVOL(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteZVOL)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
 
 // handleSnapshotOps routes snapshot operations by method
 func (a *App) handleSnapshotOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	// Check if it's a restore operation
 	if strings.HasSuffix(r.URL.Path, "/restore") {
 		if r.Method == http.MethodPost {
-			a.handleRestoreSnapshot(w, r)
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleRestoreSnapshot)).ServeHTTP(w, r)
 		} else {
 			writeError(w, errors.ErrBadRequest("method not allowed"))
 		}
@@ -158,42 +180,67 @@ func (a *App) handleSnapshotOps(w http.ResponseWriter, r *http.Request) {
 
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetSnapshot(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateSnapshot(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateSnapshot)).ServeHTTP(w, r)
+		},
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteSnapshot(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteSnapshot)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
 
 // handleSnapshotPolicyOps routes snapshot policy operations by method
 func (a *App) handleSnapshotPolicyOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetSnapshotPolicy(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateSnapshotPolicy(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
-		func(w http.ResponseWriter, r *http.Request) { a.handleUpdateSnapshotPolicy(w, r) },
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateSnapshotPolicy)).ServeHTTP(w, r)
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteSnapshotPolicy(w, r) },
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleUpdateSnapshotPolicy)).ServeHTTP(w, r)
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteSnapshotPolicy)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
 
 // handleSMBShareOps routes SMB share operations by method
 func (a *App) handleSMBShareOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetSMBShare(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateSMBShare(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
-		func(w http.ResponseWriter, r *http.Request) { a.handleUpdateSMBShare(w, r) },
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateSMBShare)).ServeHTTP(w, r)
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteSMBShare(w, r) },
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleUpdateSMBShare)).ServeHTTP(w, r)
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteSMBShare)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
 
 // handleNFSExportOps routes NFS export operations by method
 func (a *App) handleNFSExportOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetNFSExport(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateNFSExport(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
-		func(w http.ResponseWriter, r *http.Request) { a.handleUpdateNFSExport(w, r) },
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateNFSExport)).ServeHTTP(w, r)
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteNFSExport(w, r) },
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleUpdateNFSExport)).ServeHTTP(w, r)
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteNFSExport)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
@@ -206,6 +253,7 @@ func (a *App) handleBackupOps(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	switch r.Method {
 	case http.MethodGet:
 		// Check if it's a verify request
@@ -217,12 +265,12 @@ func (a *App) handleBackupOps(w http.ResponseWriter, r *http.Request) {
 	case http.MethodPost:
 		// Restore backup (POST /api/v1/backups/{id}/restore)
 		if strings.HasSuffix(r.URL.Path, "/restore") {
-			a.handleRestoreBackup(w, r)
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleRestoreBackup)).ServeHTTP(w, r)
 		} else {
 			writeError(w, errors.ErrBadRequest("invalid backup operation"))
 		}
 	case http.MethodDelete:
-		a.handleDeleteBackup(w, r)
+		a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteBackup)).ServeHTTP(w, r)
 	default:
 		writeError(w, errors.ErrBadRequest("method not allowed"))
 	}
@@ -244,9 +292,10 @@ func (a *App) handleISCSITargetOps(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	if strings.HasSuffix(r.URL.Path, "/luns") {
 		if r.Method == http.MethodPost {
-			a.handleAddLUN(w, r)
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleAddLUN)).ServeHTTP(w, r)
 			return
 		}
 		writeError(w, errors.NewAPIError(errors.ErrCodeBadRequest, "method not allowed", http.StatusMethodNotAllowed))
@@ -255,7 +304,7 @@ func (a *App) handleISCSITargetOps(w http.ResponseWriter, r *http.Request) {
 
 	if strings.HasSuffix(r.URL.Path, "/luns/remove") {
 		if r.Method == http.MethodPost {
-			a.handleRemoveLUN(w, r)
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleRemoveLUN)).ServeHTTP(w, r)
 			return
 		}
 		writeError(w, errors.NewAPIError(errors.ErrCodeBadRequest, "method not allowed", http.StatusMethodNotAllowed))
@@ -265,8 +314,12 @@ func (a *App) handleISCSITargetOps(w http.ResponseWriter, r *http.Request) {
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetISCSITarget(w, r) },
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleUpdateISCSITarget(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteISCSITarget(w, r) },
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleUpdateISCSITarget)).ServeHTTP(w, r)
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteISCSITarget)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
@@ -304,22 +357,68 @@ func (a *App) handleUserOps(w http.ResponseWriter, r *http.Request) {
 
 // handleVTLDriveOps routes VTL drive operations by method
 func (a *App) handleVTLDriveOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetVTLDrive(w, r) },
 		nil,
-		nil,
+		func(w http.ResponseWriter, r *http.Request) {
-		nil,
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleUpdateVTLDrive)).ServeHTTP(w, r)
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteVTLDrive)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }
 
 // handleVTLTapeOps routes VTL tape operations by method
 func (a *App) handleVTLTapeOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
 	methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleGetVTLTape(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateVTLTape(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateVTLTape)).ServeHTTP(w, r)
+		},
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleDeleteVTLTape(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteVTLTape)).ServeHTTP(w, r)
+		},
+		nil,
+	)(w, r)
+}
+
+// handleMediaChangerOps routes media changer operations by method
+func (a *App) handleMediaChangerOps(w http.ResponseWriter, r *http.Request) {
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
+	methodHandler(
+		func(w http.ResponseWriter, r *http.Request) {
+			// Get single changer by ID
+			libraryIDStr := pathParam(r, "/api/v1/vtl/changers/")
+			libraryID, err := strconv.Atoi(libraryIDStr)
+			if err != nil || libraryID <= 0 {
+				writeError(w, errors.ErrValidation("invalid library_id"))
+				return
+			}
+			changers, err := a.vtlService.ListMediaChangers()
+			if err != nil {
+				writeError(w, errors.ErrInternal(fmt.Sprintf("failed to list changers: %v", err)))
+				return
+			}
+			for _, changer := range changers {
+				if changer.LibraryID == libraryID {
+					writeJSON(w, http.StatusOK, changer)
+					return
+				}
+			}
+			writeError(w, errors.ErrNotFound(fmt.Sprintf("media changer %d not found", libraryID)))
+		},
+		nil,
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleUpdateMediaChanger)).ServeHTTP(w, r)
+		},
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleDeleteMediaChanger)).ServeHTTP(w, r)
+		},
 		nil,
 	)(w, r)
 }

internal/httpapp/routes.go

@@ -65,9 +65,14 @@ func (a *App) routes() {
 	a.mux.HandleFunc("/api/openapi.yaml", a.handleOpenAPISpec)
 
 	// Backup & Restore
+	// Define allowed roles for storage operations (Administrator and Operator, not Viewer)
+	storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
+
 	a.mux.HandleFunc("/api/v1/backups", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListBackups(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateBackup(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateBackup)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/backups/", a.handleBackupOps)
@@ -85,7 +90,9 @@ func (a *App) routes() {
 	))
 	a.mux.HandleFunc("/api/v1/pools", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListPools(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreatePool(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreatePool)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/pools/available", methodHandler(
@@ -94,21 +101,27 @@ func (a *App) routes() {
 	))
 	a.mux.HandleFunc("/api/v1/pools/import", methodHandler(
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleImportPool(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleImportPool)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/pools/", a.handlePoolOps)
 
 	a.mux.HandleFunc("/api/v1/datasets", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListDatasets(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateDataset(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateDataset)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/datasets/", a.handleDatasetOps)
 
 	a.mux.HandleFunc("/api/v1/zvols", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListZVOLs(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateZVOL(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateZVOL)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/zvols/", a.handleZVOLOps)
@@ -116,13 +129,17 @@ func (a *App) routes() {
 	// Snapshot Management
 	a.mux.HandleFunc("/api/v1/snapshots", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListSnapshots(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateSnapshot(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateSnapshot)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/snapshots/", a.handleSnapshotOps)
 	a.mux.HandleFunc("/api/v1/snapshot-policies", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListSnapshotPolicies(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateSnapshotPolicy(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateSnapshotPolicy)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/snapshot-policies/", a.handleSnapshotPolicyOps)
@@ -130,7 +147,9 @@ func (a *App) routes() {
 	// Storage Services - SMB
 	a.mux.HandleFunc("/api/v1/shares/smb", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListSMBShares(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateSMBShare(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateSMBShare)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/shares/smb/", a.handleSMBShareOps)
@@ -138,7 +157,9 @@ func (a *App) routes() {
 	// Storage Services - NFS
 	a.mux.HandleFunc("/api/v1/exports/nfs", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListNFSExports(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateNFSExport(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateNFSExport)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/exports/nfs/", a.handleNFSExportOps)
@@ -146,7 +167,9 @@ func (a *App) routes() {
 	// Storage Services - iSCSI
 	a.mux.HandleFunc("/api/v1/iscsi/targets", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListISCSITargets(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateISCSITarget(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateISCSITarget)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/iscsi/targets/", a.handleISCSITargetOps)
@@ -158,24 +181,36 @@ func (a *App) routes() {
 	))
 	a.mux.HandleFunc("/api/v1/vtl/drives", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListVTLDrives(w, r) },
-		nil, nil, nil, nil,
+		func(w http.ResponseWriter, r *http.Request) {
+			storageRoles := []models.Role{models.RoleAdministrator, models.RoleOperator}
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateVTLDrive)).ServeHTTP(w, r)
+		},
+		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/vtl/drives/", a.handleVTLDriveOps)
 	a.mux.HandleFunc("/api/v1/vtl/tapes", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListVTLTapes(w, r) },
-		func(w http.ResponseWriter, r *http.Request) { a.handleCreateVTLTape(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateVTLTape)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/vtl/tapes/", a.handleVTLTapeOps)
 	a.mux.HandleFunc("/api/v1/vtl/service", methodHandler(
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleVTLServiceControl(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleVTLServiceControl)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/vtl/changers", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListVTLMediaChangers(w, r) },
-		nil, nil, nil, nil,
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleCreateMediaChanger)).ServeHTTP(w, r)
+		},
+		nil, nil, nil,
 	))
+	a.mux.HandleFunc("/api/v1/vtl/changers/", a.handleMediaChangerOps)
 	a.mux.HandleFunc("/api/v1/vtl/devices/iscsi", methodHandler(
 		func(w http.ResponseWriter, r *http.Request) { a.handleListVTLDevicesForISCSI(w, r) },
 		nil, nil, nil, nil,
@@ -186,12 +221,16 @@ func (a *App) routes() {
 	))
 	a.mux.HandleFunc("/api/v1/vtl/tape/load", methodHandler(
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleLoadTape(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleLoadTape)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 	a.mux.HandleFunc("/api/v1/vtl/tape/eject", methodHandler(
 		nil,
-		func(w http.ResponseWriter, r *http.Request) { a.handleEjectTape(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			a.requireRole(storageRoles...)(http.HandlerFunc(a.handleEjectTape)).ServeHTTP(w, r)
+		},
 		nil, nil, nil,
 	))
 

internal/httpapp/vtl_handlers.go

@@ -286,6 +286,193 @@ func (a *App) handleEjectTape(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+// handleCreateMediaChanger creates a new media changer/library
+func (a *App) handleCreateMediaChanger(w http.ResponseWriter, r *http.Request) {
+	var req struct {
+		LibraryID int    `json:"library_id"`
+		Vendor    string `json:"vendor"`
+		Product   string `json:"product"`
+		Serial    string `json:"serial"`
+		NumSlots  int    `json:"num_slots"`
+	}
+
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
+		return
+	}
+
+	if req.LibraryID <= 0 {
+		writeError(w, errors.ErrValidation("library_id must be greater than 0"))
+		return
+	}
+
+	if req.NumSlots <= 0 {
+		req.NumSlots = 10 // Default number of slots
+	}
+
+	if err := a.vtlService.AddMediaChanger(req.LibraryID, req.Vendor, req.Product, req.Serial, req.NumSlots); err != nil {
+		log.Printf("create media changer error: %v", err)
+		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to create media changer: %v", err)))
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, map[string]interface{}{
+		"message":    "Media changer created successfully",
+		"library_id": req.LibraryID,
+	})
+}
+
+// handleUpdateMediaChanger updates a media changer/library configuration
+func (a *App) handleUpdateMediaChanger(w http.ResponseWriter, r *http.Request) {
+	libraryIDStr := pathParam(r, "/api/v1/vtl/changers/")
+	libraryID, err := strconv.Atoi(libraryIDStr)
+	if err != nil || libraryID <= 0 {
+		writeError(w, errors.ErrValidation("invalid library_id"))
+		return
+	}
+
+	var req struct {
+		Vendor  string `json:"vendor"`
+		Product string `json:"product"`
+		Serial  string `json:"serial"`
+	}
+
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
+		return
+	}
+
+	if err := a.vtlService.UpdateMediaChanger(libraryID, req.Vendor, req.Product, req.Serial); err != nil {
+		log.Printf("update media changer error: %v", err)
+		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to update media changer: %v", err)))
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"message":    "Media changer updated successfully",
+		"library_id": libraryID,
+	})
+}
+
+// handleDeleteMediaChanger removes a media changer/library
+func (a *App) handleDeleteMediaChanger(w http.ResponseWriter, r *http.Request) {
+	libraryIDStr := pathParam(r, "/api/v1/vtl/changers/")
+	libraryID, err := strconv.Atoi(libraryIDStr)
+	if err != nil || libraryID <= 0 {
+		writeError(w, errors.ErrValidation("invalid library_id"))
+		return
+	}
+
+	if err := a.vtlService.RemoveMediaChanger(libraryID); err != nil {
+		log.Printf("delete media changer error: %v", err)
+		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to delete media changer: %v", err)))
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"message":    "Media changer deleted successfully",
+		"library_id": libraryID,
+	})
+}
+
+// handleCreateVTLDrive creates a new drive
+func (a *App) handleCreateVTLDrive(w http.ResponseWriter, r *http.Request) {
+	var req struct {
+		DriveID   int    `json:"drive_id"`
+		LibraryID int    `json:"library_id"`
+		SlotID    int    `json:"slot_id"`
+		Vendor    string `json:"vendor"`
+		Product   string `json:"product"`
+		Serial    string `json:"serial"`
+	}
+
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
+		return
+	}
+
+	if req.DriveID <= 0 {
+		writeError(w, errors.ErrValidation("drive_id must be greater than 0"))
+		return
+	}
+
+	if req.LibraryID <= 0 {
+		writeError(w, errors.ErrValidation("library_id must be greater than 0"))
+		return
+	}
+
+	if req.SlotID <= 0 {
+		writeError(w, errors.ErrValidation("slot_id must be greater than 0"))
+		return
+	}
+
+	if err := a.vtlService.AddDrive(req.DriveID, req.LibraryID, req.SlotID, req.Vendor, req.Product, req.Serial); err != nil {
+		log.Printf("create VTL drive error: %v", err)
+		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to create VTL drive: %v", err)))
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, map[string]interface{}{
+		"message":  "Drive created successfully",
+		"drive_id": req.DriveID,
+	})
+}
+
+// handleUpdateVTLDrive updates a drive configuration
+func (a *App) handleUpdateVTLDrive(w http.ResponseWriter, r *http.Request) {
+	driveIDStr := pathParam(r, "id")
+	driveID, err := strconv.Atoi(driveIDStr)
+	if err != nil || driveID <= 0 {
+		writeError(w, errors.ErrValidation("invalid drive_id"))
+		return
+	}
+
+	var req struct {
+		LibraryID int    `json:"library_id"`
+		SlotID    int    `json:"slot_id"`
+		Vendor    string `json:"vendor"`
+		Product   string `json:"product"`
+		Serial    string `json:"serial"`
+	}
+
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, errors.ErrValidation(fmt.Sprintf("invalid request body: %v", err)))
+		return
+	}
+
+	if err := a.vtlService.UpdateDrive(driveID, req.LibraryID, req.SlotID, req.Vendor, req.Product, req.Serial); err != nil {
+		log.Printf("update VTL drive error: %v", err)
+		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to update VTL drive: %v", err)))
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]string{
+		"message":  "Drive updated successfully",
+		"drive_id": fmt.Sprintf("%d", driveID),
+	})
+}
+
+// handleDeleteVTLDrive removes a drive
+func (a *App) handleDeleteVTLDrive(w http.ResponseWriter, r *http.Request) {
+	driveIDStr := pathParam(r, "id")
+	driveID, err := strconv.Atoi(driveIDStr)
+	if err != nil || driveID <= 0 {
+		writeError(w, errors.ErrValidation("invalid drive_id"))
+		return
+	}
+
+	if err := a.vtlService.RemoveDrive(driveID); err != nil {
+		log.Printf("delete VTL drive error: %v", err)
+		writeError(w, errors.ErrInternal(fmt.Sprintf("failed to delete VTL drive: %v", err)))
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]string{
+		"message":  "Drive deleted successfully",
+		"drive_id": fmt.Sprintf("%d", driveID),
+	})
+}
+
 // handleListVTLDevicesForISCSI returns all tape devices (drives and medium changers) for iSCSI passthrough
 func (a *App) handleListVTLDevicesForISCSI(w http.ResponseWriter, r *http.Request) {
 	devices := []map[string]interface{}{}

internal/services/vtl.go

@@ -740,7 +740,12 @@ func (s *VTLService) ListMediaChangers() ([]models.VTLMediaChanger, error) {
 
 	// Parse device.conf to get libraries
 	deviceConfig, err := s.parseDeviceConfig()
+	if err != nil {
+		log.Printf("Warning: failed to parse device.conf: %v", err)
+	}
+
 	if err == nil && len(deviceConfig.Libraries) > 0 {
+		log.Printf("Found %d libraries in device.conf", len(deviceConfig.Libraries))
 		// Count drives per library
 		drivesPerLibrary := make(map[int]int)
 		for _, drive := range deviceConfig.Drives {
@@ -750,11 +755,37 @@ func (s *VTLService) ListMediaChangers() ([]models.VTLMediaChanger, error) {
 		// Count slots per library from library_contents
 		slotsPerLibrary := make(map[int]int)
 		for _, lib := range deviceConfig.Libraries {
-			slotMap, err := s.parseLibraryContents(lib.ID)
+			// Count all slots (including empty ones) by reading file directly
-			if err == nil {
+			contentsPath := fmt.Sprintf("/etc/mhvtl/library_contents.%d", lib.ID)
-				slotsPerLibrary[lib.ID] = len(slotMap)
+			if file, err := os.Open(contentsPath); err == nil {
+				scanner := bufio.NewScanner(file)
+				slotRegex := regexp.MustCompile(`^Slot\s+(\d+):`)
+				maxSlot := 0
+				for scanner.Scan() {
+					line := strings.TrimSpace(scanner.Text())
+					if line == "" || strings.HasPrefix(line, "#") {
+						continue
+					}
+					if matches := slotRegex.FindStringSubmatch(line); len(matches) >= 2 {
+						if slotID, err := strconv.Atoi(matches[1]); err == nil && slotID > maxSlot {
+							maxSlot = slotID
+						}
+					}
+				}
+				file.Close()
+				if maxSlot > 0 {
+					slotsPerLibrary[lib.ID] = maxSlot
+				} else {
+					// Fallback: try parseLibraryContents
+					slotMap, _ := s.parseLibraryContents(lib.ID)
+					slotsPerLibrary[lib.ID] = len(slotMap)
+					if slotsPerLibrary[lib.ID] == 0 {
+						slotsPerLibrary[lib.ID] = 10 // Default
+					}
+				}
 			} else {
-				slotsPerLibrary[lib.ID] = 10 // Default
+				// File doesn't exist, use default
+				slotsPerLibrary[lib.ID] = 10
 			}
 		}
 
@@ -1026,6 +1057,542 @@ func (s *VTLService) parseDeviceConfig() (*DeviceConfig, error) {
 	return config, scanner.Err()
 }
 
+// writeDeviceConfig writes device.conf from DeviceConfig struct
+func (s *VTLService) writeDeviceConfig(config *DeviceConfig) error {
+	// Ensure filesystem is writable (remount if needed)
+	parentDir := filepath.Dir(s.deviceConfigPath)
+	if err := s.ensureWritableFilesystem(parentDir); err != nil {
+		log.Printf("Warning: failed to ensure writable filesystem for %s: %v", parentDir, err)
+		// Continue anyway, might still work
+	}
+
+	// Create backup of existing config
+	backupPath := s.deviceConfigPath + ".backup"
+	if _, err := os.Stat(s.deviceConfigPath); err == nil {
+		// File exists, create backup
+		if err := exec.Command("cp", s.deviceConfigPath, backupPath).Run(); err != nil {
+			log.Printf("Warning: failed to create backup of device.conf: %v", err)
+		}
+	}
+
+	// Try to create file, if it fails due to read-only, try remount again
+	file, err := os.Create(s.deviceConfigPath)
+	if err != nil {
+		// Check if it's a read-only filesystem error
+		if strings.Contains(err.Error(), "read-only") || strings.Contains(err.Error(), "read only") {
+			log.Printf("Filesystem is read-only, attempting remount for %s", parentDir)
+			if remountErr := s.remountReadWrite(parentDir); remountErr != nil {
+				return fmt.Errorf("failed to remount filesystem as read-write: %v", remountErr)
+			}
+			// Try again after remount
+			file, err = os.Create(s.deviceConfigPath)
+			if err != nil {
+				return fmt.Errorf("failed to create device.conf after remount: %v", err)
+			}
+		} else {
+			return fmt.Errorf("failed to create device.conf: %v", err)
+		}
+	}
+	defer file.Close()
+
+	writer := bufio.NewWriter(file)
+
+	// Write libraries and their drives
+	for _, lib := range config.Libraries {
+		// Write library header
+		writer.WriteString(fmt.Sprintf("Library: %d CHANNEL: 00 TARGET: 00 LUN: 00\n", lib.ID))
+		if lib.Vendor != "" {
+			writer.WriteString(fmt.Sprintf("Vendor identification: %s\n", lib.Vendor))
+		} else {
+			writer.WriteString("Vendor identification: STK\n")
+		}
+		if lib.Product != "" {
+			writer.WriteString(fmt.Sprintf("Product identification: %s\n", lib.Product))
+		} else {
+			// Default product based on library ID
+			if lib.ID == 30 {
+				writer.WriteString("Product identification: L80\n")
+			} else {
+				writer.WriteString("Product identification: L700\n")
+			}
+		}
+		if lib.Serial != "" {
+			writer.WriteString(fmt.Sprintf("Unit serial number: %s\n", lib.Serial))
+		} else {
+			writer.WriteString(fmt.Sprintf("Unit serial number: %08d\n", lib.ID))
+		}
+		writer.WriteString("\n")
+
+		// Write drives for this library
+		for _, drive := range config.Drives {
+			if drive.LibraryID == lib.ID {
+				// Calculate CHANNEL, TARGET, LUN from drive ID
+				// Drive ID format: libraryID * 10 + slot (e.g., 11 = library 10, slot 1)
+				channel := "00"
+				target := fmt.Sprintf("%02d", (drive.ID%100)/10)
+				lun := "00"
+
+				writer.WriteString(fmt.Sprintf("Drive: %d CHANNEL: %s TARGET: %s LUN: %s\n", drive.ID, channel, target, lun))
+				writer.WriteString(fmt.Sprintf("Library ID: %d\n", drive.LibraryID))
+				writer.WriteString(fmt.Sprintf("Slot: %d\n", drive.SlotID))
+				if drive.Vendor != "" {
+					writer.WriteString(fmt.Sprintf("Vendor identification: %s\n", drive.Vendor))
+				} else {
+					writer.WriteString("Vendor identification: IBM\n")
+				}
+				if drive.Product != "" {
+					writer.WriteString(fmt.Sprintf("Product identification: %s\n", drive.Product))
+				} else {
+					writer.WriteString("Product identification: ULT3580-TD5\n")
+				}
+				if drive.Serial != "" {
+					writer.WriteString(fmt.Sprintf("Unit serial number: %s\n", drive.Serial))
+				} else {
+					writer.WriteString(fmt.Sprintf("Unit serial number: %08d\n", drive.ID))
+				}
+				writer.WriteString("\n")
+			}
+		}
+	}
+
+	// Flush and sync to ensure data is written to disk
+	if err := writer.Flush(); err != nil {
+		return fmt.Errorf("failed to flush device.conf: %v", err)
+	}
+	if err := file.Sync(); err != nil {
+		log.Printf("Warning: failed to sync device.conf: %v", err)
+	}
+
+	log.Printf("Successfully wrote device.conf with %d libraries and %d drives", len(config.Libraries), len(config.Drives))
+	return nil
+}
+
+// AddMediaChanger adds a new media changer/library to device.conf
+func (s *VTLService) AddMediaChanger(libraryID int, vendor, product, serial string, numSlots int) error {
+	if libraryID <= 0 {
+		return fmt.Errorf("library ID must be greater than 0")
+	}
+
+	// Parse existing config
+	config, err := s.parseDeviceConfig()
+	if err != nil {
+		// If file doesn't exist, create new config
+		config = &DeviceConfig{
+			Libraries: []LibraryConfig{},
+			Drives:    []DriveConfig{},
+		}
+	}
+
+	// Check if library already exists
+	for _, lib := range config.Libraries {
+		if lib.ID == libraryID {
+			return fmt.Errorf("library %d already exists", libraryID)
+		}
+	}
+
+	// Set defaults
+	if vendor == "" {
+		vendor = "STK"
+	}
+	if product == "" {
+		if libraryID == 30 {
+			product = "L80"
+		} else {
+			product = "L700"
+		}
+	}
+	if serial == "" {
+		serial = fmt.Sprintf("%08d", libraryID)
+	}
+
+	// Add new library
+	newLib := LibraryConfig{
+		ID:      libraryID,
+		Vendor:  vendor,
+		Product: product,
+		Serial:  serial,
+	}
+	config.Libraries = append(config.Libraries, newLib)
+
+	// Write updated config
+	if err := s.writeDeviceConfig(config); err != nil {
+		return fmt.Errorf("failed to write device.conf: %v", err)
+	}
+
+	// Create library_contents file if it doesn't exist
+	contentsPath := fmt.Sprintf("/etc/mhvtl/library_contents.%d", libraryID)
+	if _, err := os.Stat(contentsPath); os.IsNotExist(err) {
+		// Ensure filesystem is writable
+		parentDir := filepath.Dir(contentsPath)
+		if err := s.ensureWritableFilesystem(parentDir); err != nil {
+			log.Printf("Warning: failed to ensure writable filesystem for %s: %v", parentDir, err)
+		}
+
+		file, err := os.Create(contentsPath)
+		if err != nil {
+			// If read-only, try remount
+			if strings.Contains(err.Error(), "read-only") || strings.Contains(err.Error(), "read only") {
+				if remountErr := s.remountReadWrite(parentDir); remountErr != nil {
+					log.Printf("Warning: failed to remount for library_contents: %v", remountErr)
+				} else {
+					// Retry after remount
+					file, err = os.Create(contentsPath)
+				}
+			}
+			if err != nil {
+				log.Printf("Warning: failed to create library_contents.%d: %v", libraryID, err)
+			} else {
+				defer file.Close()
+				// Write library_contents in correct format
+				file.WriteString("VERSION: 2\n\n")
+				// Drives will be added when drives are assigned to this library
+				file.WriteString("Picker 1:\n\n")
+				// Initialize with empty slots (MAP entries)
+				for i := 1; i <= numSlots; i++ {
+					file.WriteString(fmt.Sprintf("MAP %d:\n", i))
+				}
+				log.Printf("Created library_contents.%d with %d slots", libraryID, numSlots)
+			}
+		} else {
+			defer file.Close()
+			// Write library_contents in correct format
+			file.WriteString("VERSION: 2\n\n")
+			// Drives will be added when drives are assigned to this library
+			file.WriteString("Picker 1:\n\n")
+			// Initialize with empty slots (MAP entries)
+			for i := 1; i <= numSlots; i++ {
+				file.WriteString(fmt.Sprintf("MAP %d:\n", i))
+			}
+			log.Printf("Created library_contents.%d with %d slots", libraryID, numSlots)
+		}
+	}
+
+	// Restart mhvtl service to reflect changes (new library needs to be detected)
+	if err := s.RestartService(); err != nil {
+		log.Printf("Warning: failed to restart mhvtl service after adding media changer: %v", err)
+		// Continue even if restart fails - library is added to config
+	}
+
+	log.Printf("Added media changer: Library %d (%s %s)", libraryID, vendor, product)
+	return nil
+}
+
+// RemoveMediaChanger removes a media changer/library from device.conf
+func (s *VTLService) RemoveMediaChanger(libraryID int) error {
+	if libraryID <= 0 {
+		return fmt.Errorf("library ID must be greater than 0")
+	}
+
+	// Parse existing config
+	config, err := s.parseDeviceConfig()
+	if err != nil {
+		return fmt.Errorf("failed to parse device.conf: %v", err)
+	}
+
+	// Find and remove library
+	found := false
+	newLibraries := []LibraryConfig{}
+	for _, lib := range config.Libraries {
+		if lib.ID != libraryID {
+			newLibraries = append(newLibraries, lib)
+		} else {
+			found = true
+		}
+	}
+
+	if !found {
+		return fmt.Errorf("library %d not found", libraryID)
+	}
+
+	// Remove all drives associated with this library
+	newDrives := []DriveConfig{}
+	for _, drive := range config.Drives {
+		if drive.LibraryID != libraryID {
+			newDrives = append(newDrives, drive)
+		}
+	}
+
+	config.Libraries = newLibraries
+	config.Drives = newDrives
+
+	// Write updated config
+	if err := s.writeDeviceConfig(config); err != nil {
+		return fmt.Errorf("failed to write device.conf: %v", err)
+	}
+
+	// Optionally remove library_contents file (but keep it for safety)
+	// contentsPath := fmt.Sprintf("/etc/mhvtl/library_contents.%d", libraryID)
+	// os.Remove(contentsPath)
+
+	// Restart mhvtl service to reflect changes (library removal)
+	if err := s.RestartService(); err != nil {
+		log.Printf("Warning: failed to restart mhvtl service after removing media changer: %v", err)
+		// Continue even if restart fails - library is removed from config
+	}
+
+	log.Printf("Removed media changer: Library %d", libraryID)
+	return nil
+}
+
+// UpdateMediaChanger updates a media changer/library configuration
+func (s *VTLService) UpdateMediaChanger(libraryID int, vendor, product, serial string) error {
+	if libraryID <= 0 {
+		return fmt.Errorf("library ID must be greater than 0")
+	}
+
+	// Parse existing config
+	config, err := s.parseDeviceConfig()
+	if err != nil {
+		return fmt.Errorf("failed to parse device.conf: %v", err)
+	}
+
+	// Find and update library
+	found := false
+	for i := range config.Libraries {
+		if config.Libraries[i].ID == libraryID {
+			if vendor != "" {
+				config.Libraries[i].Vendor = vendor
+			}
+			if product != "" {
+				config.Libraries[i].Product = product
+			}
+			if serial != "" {
+				config.Libraries[i].Serial = serial
+			}
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		return fmt.Errorf("library %d not found", libraryID)
+	}
+
+	// Write updated config
+	if err := s.writeDeviceConfig(config); err != nil {
+		return fmt.Errorf("failed to write device.conf: %v", err)
+	}
+
+	// Restart mhvtl service to reflect changes (library config update)
+	if err := s.RestartService(); err != nil {
+		log.Printf("Warning: failed to restart mhvtl service after updating media changer: %v", err)
+		// Continue even if restart fails - library is updated in config
+	}
+
+	log.Printf("Updated media changer: Library %d", libraryID)
+	return nil
+}
+
+// AddDrive adds a new drive to device.conf
+func (s *VTLService) AddDrive(driveID, libraryID, slotID int, vendor, product, serial string) error {
+	if driveID <= 0 {
+		return fmt.Errorf("drive ID must be greater than 0")
+	}
+	if libraryID <= 0 {
+		return fmt.Errorf("library ID must be greater than 0")
+	}
+	if slotID <= 0 {
+		return fmt.Errorf("slot ID must be greater than 0")
+	}
+
+	// Parse existing config
+	config, err := s.parseDeviceConfig()
+	if err != nil {
+		// If file doesn't exist, create new config
+		config = &DeviceConfig{
+			Libraries: []LibraryConfig{},
+			Drives:    []DriveConfig{},
+		}
+	}
+
+	// Check if library exists
+	libraryExists := false
+	for _, lib := range config.Libraries {
+		if lib.ID == libraryID {
+			libraryExists = true
+			break
+		}
+	}
+	if !libraryExists {
+		return fmt.Errorf("library %d does not exist", libraryID)
+	}
+
+	// Check if drive already exists
+	for _, drive := range config.Drives {
+		if drive.ID == driveID {
+			return fmt.Errorf("drive %d already exists", driveID)
+		}
+	}
+
+	// Calculate TARGET for this drive (used to determine device path)
+	// TARGET = (driveID % 100) / 10
+	// This ensures each drive gets a unique TARGET
+	newTarget := (driveID % 100) / 10
+
+	// Check for TARGET conflict with existing drives
+	// Each TARGET maps to a unique device path (/dev/stX), so we need to ensure uniqueness
+	for _, drive := range config.Drives {
+		existingTarget := (drive.ID % 100) / 10
+		if existingTarget == newTarget {
+			// TARGET maps to device: TARGET 01 -> /dev/st0, TARGET 02 -> /dev/st1, etc.
+			deviceNum := newTarget - 1
+			return fmt.Errorf("drive ID %d would conflict with drive %d (both use TARGET %02d, device /dev/st%d). Please use a different drive ID", driveID, drive.ID, existingTarget, deviceNum)
+		}
+	}
+
+	// Set defaults
+	if vendor == "" {
+		vendor = "IBM"
+	}
+	if product == "" {
+		product = "ULT3580-TD5"
+	}
+	if serial == "" {
+		serial = fmt.Sprintf("%08d", driveID)
+	}
+
+	// Add new drive
+	newDrive := DriveConfig{
+		ID:        driveID,
+		LibraryID: libraryID,
+		SlotID:    slotID,
+		Vendor:    vendor,
+		Product:   product,
+		Serial:    serial,
+	}
+	config.Drives = append(config.Drives, newDrive)
+
+	// Write updated config
+	if err := s.writeDeviceConfig(config); err != nil {
+		return fmt.Errorf("failed to write device.conf: %v", err)
+	}
+
+	// Update library_contents to add Drive entry if not exists
+	if err := s.updateLibraryContentsForDrive(libraryID, driveID); err != nil {
+		log.Printf("Warning: failed to update library_contents.%d for drive %d: %v", libraryID, driveID, err)
+		// Continue even if library_contents update fails
+	}
+
+	// Restart mhvtl service to reflect changes (new drive needs to be detected)
+	if err := s.RestartService(); err != nil {
+		log.Printf("Warning: failed to restart mhvtl service after adding drive: %v", err)
+		// Continue even if restart fails - drive is added to config
+	}
+
+	log.Printf("Added drive: Drive %d (Library %d, Slot %d)", driveID, libraryID, slotID)
+	return nil
+}
+
+// RemoveDrive removes a drive from device.conf
+func (s *VTLService) RemoveDrive(driveID int) error {
+	if driveID <= 0 {
+		return fmt.Errorf("drive ID must be greater than 0")
+	}
+
+	// Parse existing config
+	config, err := s.parseDeviceConfig()
+	if err != nil {
+		return fmt.Errorf("failed to parse device.conf: %v", err)
+	}
+
+	// Find and remove drive
+	found := false
+	newDrives := []DriveConfig{}
+	for _, drive := range config.Drives {
+		if drive.ID != driveID {
+			newDrives = append(newDrives, drive)
+		} else {
+			found = true
+		}
+	}
+
+	if !found {
+		return fmt.Errorf("drive %d not found", driveID)
+	}
+
+	config.Drives = newDrives
+
+	// Write updated config
+	if err := s.writeDeviceConfig(config); err != nil {
+		return fmt.Errorf("failed to write device.conf: %v", err)
+	}
+
+	// Restart mhvtl service to reflect changes (drive removal)
+	if err := s.RestartService(); err != nil {
+		log.Printf("Warning: failed to restart mhvtl service after removing drive: %v", err)
+		// Continue even if restart fails - drive is removed from config
+	}
+
+	log.Printf("Removed drive: Drive %d", driveID)
+	return nil
+}
+
+// UpdateDrive updates a drive configuration
+func (s *VTLService) UpdateDrive(driveID, libraryID, slotID int, vendor, product, serial string) error {
+	if driveID <= 0 {
+		return fmt.Errorf("drive ID must be greater than 0")
+	}
+
+	// Parse existing config
+	config, err := s.parseDeviceConfig()
+	if err != nil {
+		return fmt.Errorf("failed to parse device.conf: %v", err)
+	}
+
+	// Find and update drive
+	found := false
+	for i := range config.Drives {
+		if config.Drives[i].ID == driveID {
+			if libraryID > 0 {
+				// Check if library exists
+				libraryExists := false
+				for _, lib := range config.Libraries {
+					if lib.ID == libraryID {
+						libraryExists = true
+						break
+					}
+				}
+				if !libraryExists {
+					return fmt.Errorf("library %d does not exist", libraryID)
+				}
+				config.Drives[i].LibraryID = libraryID
+			}
+			if slotID > 0 {
+				config.Drives[i].SlotID = slotID
+			}
+			if vendor != "" {
+				config.Drives[i].Vendor = vendor
+			}
+			if product != "" {
+				config.Drives[i].Product = product
+			}
+			if serial != "" {
+				config.Drives[i].Serial = serial
+			}
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		return fmt.Errorf("drive %d not found", driveID)
+	}
+
+	// Write updated config
+	if err := s.writeDeviceConfig(config); err != nil {
+		return fmt.Errorf("failed to write device.conf: %v", err)
+	}
+
+	// Restart mhvtl service to reflect changes (drive config update)
+	if err := s.RestartService(); err != nil {
+		log.Printf("Warning: failed to restart mhvtl service after updating drive: %v", err)
+		// Continue even if restart fails - drive is updated in config
+	}
+
+	log.Printf("Updated drive: Drive %d", driveID)
+	return nil
+}
+
 // parseLibraryContents parses library_contents.X file
 func (s *VTLService) parseLibraryContents(libraryID int) (map[int]string, error) {
 	// Map slot ID to barcode
@@ -1067,32 +1634,31 @@ func (s *VTLService) parseLibraryContents(libraryID int) (map[int]string, error)
 }
 
 // findDeviceForDrive finds device path for a drive ID
+// In mhvtl, device path is determined by the order drives appear in device.conf
+// TARGET number in device.conf maps to device: TARGET 01 -> /dev/st0, TARGET 02 -> /dev/st1, etc.
 func (s *VTLService) findDeviceForDrive(driveID int) string {
-	// Try to find device in /sys/class/scsi_tape/
+	// Parse device.conf to get TARGET for this drive
-	tapePath := "/sys/class/scsi_tape"
+	deviceConfig, err := s.parseDeviceConfig()
-	entries, err := os.ReadDir(tapePath)
+	if err == nil {
-	if err != nil {
+		// Find the drive and calculate its TARGET
-		return fmt.Sprintf("/dev/st%d", driveID%10) // Fallback
+		for _, drive := range deviceConfig.Drives {
-	}
+			if drive.ID == driveID {
-
+				// Calculate TARGET from drive ID (same as in writeDeviceConfig)
-	for _, entry := range entries {
+				target := (driveID % 100) / 10
-		if !entry.IsDir() {
+				// In mhvtl: TARGET 01 -> /dev/st0, TARGET 02 -> /dev/st1, TARGET 03 -> /dev/st2
-			continue
+				// Device numbering is 0-based, TARGET is effectively 1-based for the ones digit
-		}
+				// So: TARGET 01 (ones=1) -> st0, TARGET 02 (ones=2) -> st1, etc.
-		deviceName := entry.Name()
+				return fmt.Sprintf("/dev/st%d", target-1)
-		if !strings.HasPrefix(deviceName, "st") && !strings.HasPrefix(deviceName, "nst") {
+			}
-			continue
-		}
-
-		// Check if this device matches the drive ID
-		// This is a simplified check - in real implementation, we'd need to map device to drive ID
-		deviceID := s.getDriveIDFromDevice(deviceName)
-		if deviceID == driveID {
-			return fmt.Sprintf("/dev/%s", deviceName)
 		}
 	}
 
-	return fmt.Sprintf("/dev/st%d", driveID%10) // Fallback
+	// Fallback: calculate TARGET from drive ID
+	target := (driveID % 100) / 10
+	if target > 0 {
+		return fmt.Sprintf("/dev/st%d", target-1) // TARGET 01 -> st0, TARGET 02 -> st1
+	}
+	return fmt.Sprintf("/dev/st0") // Default fallback
 }
 
 // checkMediaLoadedByDriveID checks if media is loaded in a drive by drive ID
@@ -1477,6 +2043,200 @@ func (s *VTLService) addTapeToLibraryContents(libraryID int, slotID int, barcode
 	return nil
 }
 
+// updateLibraryContentsForDrive adds or updates Drive entry in library_contents file
+func (s *VTLService) updateLibraryContentsForDrive(libraryID, driveID int) error {
+	contentsPath := fmt.Sprintf("/etc/mhvtl/library_contents.%d", libraryID)
+
+	// Ensure filesystem is writable
+	parentDir := filepath.Dir(contentsPath)
+	if err := s.ensureWritableFilesystem(parentDir); err != nil {
+		log.Printf("Warning: failed to ensure writable filesystem for %s: %v", parentDir, err)
+	}
+
+	// Check if file exists, if not create it with proper format
+	file, err := os.OpenFile(contentsPath, os.O_RDWR|os.O_CREATE, 0644)
+	if err != nil {
+		// If read-only, try remount
+		if strings.Contains(err.Error(), "read-only") || strings.Contains(err.Error(), "read only") {
+			if remountErr := s.remountReadWrite(parentDir); remountErr != nil {
+				return fmt.Errorf("failed to remount filesystem: %v", remountErr)
+			}
+			// Retry after remount
+			file, err = os.OpenFile(contentsPath, os.O_RDWR|os.O_CREATE, 0644)
+			if err != nil {
+				return fmt.Errorf("failed to open library_contents file after remount: %v", err)
+			}
+		} else {
+			return fmt.Errorf("failed to open library_contents file: %v", err)
+		}
+	}
+	defer file.Close()
+
+	// Read all lines
+	var lines []string
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	if err := scanner.Err(); err != nil {
+		return fmt.Errorf("failed to read library_contents file: %v", err)
+	}
+
+	// If file is empty or doesn't have VERSION, create new format
+	if len(lines) == 0 {
+		lines = []string{
+			"VERSION: 2",
+			"",
+			"Picker 1:",
+			"",
+		}
+	} else {
+		// Check if VERSION exists
+		hasVersion := false
+		for _, line := range lines {
+			if strings.Contains(strings.TrimSpace(line), "VERSION:") {
+				hasVersion = true
+				break
+			}
+		}
+		if !hasVersion {
+			// Prepend VERSION
+			lines = append([]string{"VERSION: 2", ""}, lines...)
+		}
+	}
+
+	// Find drive number (sequential number for drives in this library)
+	// Count existing drives
+	driveRegex := regexp.MustCompile(`^Drive\s+(\d+):`)
+	maxDriveNum := 0
+	driveExists := false
+	driveNum := 0
+
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if matches := driveRegex.FindStringSubmatch(trimmed); len(matches) >= 2 {
+			if num, err := strconv.Atoi(matches[1]); err == nil {
+				if num > maxDriveNum {
+					maxDriveNum = num
+				}
+			}
+		}
+	}
+
+	// Check if this drive already exists (by checking device.conf drive ID mapping)
+	// For now, we'll use sequential numbering
+	// Find if drive entry already exists by checking all drives in device.conf for this library
+	deviceConfig, err := s.parseDeviceConfig()
+	if err == nil {
+		driveIndex := 1
+		for _, drive := range deviceConfig.Drives {
+			if drive.LibraryID == libraryID {
+				if drive.ID == driveID {
+					driveNum = driveIndex
+					break
+				}
+				driveIndex++
+			}
+		}
+		if driveNum == 0 {
+			driveNum = maxDriveNum + 1
+		}
+	} else {
+		driveNum = maxDriveNum + 1
+	}
+
+	// Check if Drive entry already exists
+	drivePattern := fmt.Sprintf("Drive %d:", driveNum)
+	for _, line := range lines {
+		if strings.Contains(strings.TrimSpace(line), drivePattern) {
+			driveExists = true
+			break
+		}
+	}
+
+	// If drive already exists, no need to update
+	if driveExists {
+		return nil
+	}
+
+	// Build new lines
+	var newLines []string
+	insertedDrive := false
+	afterVersion := false
+	pickerFound := false
+
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+
+		// Track position after VERSION
+		if strings.Contains(trimmed, "VERSION:") {
+			afterVersion = true
+			newLines = append(newLines, line)
+			continue
+		}
+
+		// Insert Drive entries after VERSION and before Picker
+		if afterVersion && !insertedDrive {
+			if strings.HasPrefix(trimmed, "Picker") {
+				pickerFound = true
+				// Insert drive before Picker
+				newLines = append(newLines, fmt.Sprintf("Drive %d:", driveNum))
+				newLines = append(newLines, "") // Empty line
+				insertedDrive = true
+			} else if strings.HasPrefix(trimmed, "MAP") && !pickerFound {
+				// If no Picker found, insert before MAP
+				newLines = append(newLines, fmt.Sprintf("Drive %d:", driveNum))
+				newLines = append(newLines, "") // Empty line
+				insertedDrive = true
+			}
+		}
+
+		newLines = append(newLines, line)
+	}
+
+	// If drive wasn't inserted, add it at appropriate position
+	if !insertedDrive {
+		// Find position to insert (after VERSION, before Picker or MAP)
+		insertPos := -1
+		for idx, line := range newLines {
+			trimmed := strings.TrimSpace(line)
+			if strings.HasPrefix(trimmed, "Picker") || strings.HasPrefix(trimmed, "MAP") {
+				insertPos = idx
+				break
+			}
+		}
+		if insertPos == -1 {
+			// Add at end
+			newLines = append(newLines, fmt.Sprintf("Drive %d:", driveNum))
+		} else {
+			// Insert at position
+			newLines = append(newLines[:insertPos], append([]string{fmt.Sprintf("Drive %d:", driveNum), ""}, newLines[insertPos:]...)...)
+		}
+	}
+
+	// Write back to file
+	if err := file.Truncate(0); err != nil {
+		return fmt.Errorf("failed to truncate library_contents file: %v", err)
+	}
+	if _, err := file.Seek(0, 0); err != nil {
+		return fmt.Errorf("failed to seek library_contents file: %v", err)
+	}
+
+	writer := bufio.NewWriter(file)
+	for _, line := range newLines {
+		writer.WriteString(line + "\n")
+	}
+	if err := writer.Flush(); err != nil {
+		return fmt.Errorf("failed to flush library_contents file: %v", err)
+	}
+	if err := file.Sync(); err != nil {
+		log.Printf("Warning: failed to sync library_contents file: %v", err)
+	}
+
+	log.Printf("Updated library_contents.%d with Drive %d entry", libraryID, driveNum)
+	return nil
+}
+
 // ensureWritableFilesystem checks if filesystem is writable and remounts if needed
 func (s *VTLService) ensureWritableFilesystem(path string) error {
 	// Try to create a test file to check if writable
@@ -1498,9 +2258,12 @@ func (s *VTLService) remountReadWrite(path string) error {
 	// Try /opt first, then /, then use findmnt
 	var mountPoint string
 
-	// Check if path is under /opt
+	// Check if path is under /opt or /etc
 	if strings.HasPrefix(path, "/opt") {
 		mountPoint = "/opt"
+	} else if strings.HasPrefix(path, "/etc") {
+		// For /etc, we need to remount root filesystem
+		mountPoint = "/"
 	} else {
 		mountPoint = "/"
 	}

scripts/push-to-repo.sh

@@ -0,0 +1,113 @@
+#!/bin/bash
+#
+# Script to push Atlas changes to repository
+# This script commits all changes, updates version, and pushes to remote
+#
+# Usage: ./scripts/push-to-repo.sh [commit message] [--skip-version]
+#
+
+set -e
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Get script directory
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+cd "$REPO_ROOT"
+
+# Check if git is available
+if ! command -v git &>/dev/null; then
+    echo -e "${RED}Error: git is not installed${NC}"
+    exit 1
+fi
+
+# Check if we're in a git repository
+if ! git rev-parse --git-dir &>/dev/null; then
+    echo -e "${RED}Error: Not in a git repository${NC}"
+    exit 1
+fi
+
+# Get commit message from argument or use default
+COMMIT_MSG="${1:-Update Atlas with VTL features and improvements}"
+
+# Check if --skip-version flag is set
+SKIP_VERSION=false
+if [[ "$*" == *"--skip-version"* ]]; then
+    SKIP_VERSION=true
+fi
+
+echo -e "${GREEN}Preparing to push changes to repository...${NC}"
+
+# Check for uncommitted changes
+if git diff --quiet && git diff --cached --quiet; then
+    echo -e "${YELLOW}No changes to commit${NC}"
+    exit 0
+fi
+
+# Show status
+echo -e "${GREEN}Current git status:${NC}"
+git status --short
+
+# Ask for confirmation
+read -p "Continue with commit and push? (y/n) " -n 1 -r
+echo ""
+if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+    echo -e "${YELLOW}Aborted${NC}"
+    exit 0
+fi
+
+# Update version if not skipped
+if [[ "$SKIP_VERSION" == false ]]; then
+    echo -e "${GREEN}Updating version...${NC}"
+    # You can add version update logic here if needed
+    # For example, update a VERSION file or tag
+fi
+
+# Stage all changes
+echo -e "${GREEN}Staging all changes...${NC}"
+git add -A
+
+# Commit changes
+echo -e "${GREEN}Committing changes...${NC}"
+git commit -m "$COMMIT_MSG" || {
+    echo -e "${YELLOW}No changes to commit${NC}"
+    exit 0
+}
+
+# Get current branch
+CURRENT_BRANCH=$(git branch --show-current)
+echo -e "${GREEN}Current branch: $CURRENT_BRANCH${NC}"
+
+# Check if remote exists
+if ! git remote | grep -q origin; then
+    echo -e "${YELLOW}Warning: No 'origin' remote found${NC}"
+    read -p "Do you want to set up a remote? (y/n) " -n 1 -r
+    echo ""
+    if [[ $REPLY =~ ^[Yy]$ ]]; then
+        read -p "Enter remote URL: " REMOTE_URL
+        git remote add origin "$REMOTE_URL"
+    else
+        echo -e "${YELLOW}Skipping push (no remote configured)${NC}"
+        exit 0
+    fi
+fi
+
+# Push to remote
+echo -e "${GREEN}Pushing to remote repository...${NC}"
+if git push origin "$CURRENT_BRANCH"; then
+    echo -e "${GREEN}✓ Successfully pushed to repository${NC}"
+else
+    echo -e "${RED}✗ Push failed${NC}"
+    echo "You may need to:"
+    echo "  1. Set upstream: git push -u origin $CURRENT_BRANCH"
+    echo "  2. Pull first: git pull origin $CURRENT_BRANCH"
+    exit 1
+fi
+
+echo -e "${GREEN}Done!${NC}"
+

web/templates/iscsi.html

@@ -143,8 +143,45 @@
       window.location.href = '/login?return=' + encodeURIComponent(window.location.pathname);
       return;
     }
+    
+    // Hide create/update/delete buttons for viewer role
+    hideButtonsForViewer();
   })();
 
+  // Get current user role
+  function getCurrentUserRole() {
+    try {
+      const userStr = localStorage.getItem('atlas_user');
+      if (userStr) {
+        const user = JSON.parse(userStr);
+        return (user.role || '').toLowerCase();
+      }
+    } catch (e) {
+      console.error('Error parsing user data:', e);
+    }
+    return '';
+  }
+
+  // Check if current user is viewer
+  function isViewer() {
+    return getCurrentUserRole() === 'viewer';
+  }
+
+  // Hide create/update/delete buttons for viewer role
+  function hideButtonsForViewer() {
+    if (isViewer()) {
+      // Hide create buttons
+      document.querySelectorAll('button').forEach(btn => {
+        const text = btn.textContent || '';
+        const onclick = btn.getAttribute('onclick') || '';
+        if (text.includes('Create') || text.includes('Add LUN') || text.includes('Delete') ||
+            onclick.includes('showCreate') || onclick.includes('addLUN') || onclick.includes('deleteISCSITarget')) {
+          btn.style.display = 'none';
+        }
+      });
+    }
+  }
+
 function getAuthHeaders() {
   const token = localStorage.getItem('atlas_token');
   return {

web/templates/management.html

@@ -88,7 +88,8 @@
       </div>
       <div>
         <label class="block text-sm font-medium text-slate-300 mb-1">Password *</label>
-        <input type="password" name="password" required class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <input type="password" name="password" required minlength="8" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Minimum 8 characters required</p>
       </div>
       <div>
         <label class="block text-sm font-medium text-slate-300 mb-1">Role *</label>
@@ -534,13 +535,50 @@ async function loadUsers(forceRefresh = false) {
 }
 
 function showCreateUserModal() {
+  // Reset form when opening modal
+  const form = document.getElementById('create-user-form');
+  if (form) {
+    form.reset();
+  }
   document.getElementById('create-user-modal').classList.remove('hidden');
 }
 
+// Flag to prevent double submission
+let isCreatingUser = false;
+
 async function createUser(e) {
   e.preventDefault();
+  
+  // Prevent double submission
+  if (isCreatingUser) {
+    console.log('User creation already in progress, ignoring duplicate submission');
+    return;
+  }
+  
+  isCreatingUser = true;
+  const submitButton = e.target.querySelector('button[type="submit"]');
+  const originalButtonText = submitButton ? submitButton.textContent : '';
+  
+  // Disable submit button to prevent double clicks
+  if (submitButton) {
+    submitButton.disabled = true;
+    submitButton.textContent = 'Creating...';
+  }
+  
   const formData = new FormData(e.target);
   
+  // Frontend validation
+  const password = formData.get('password');
+  if (password && password.length < 8) {
+    alert('Error: Password must be at least 8 characters long');
+    isCreatingUser = false;
+    if (submitButton) {
+      submitButton.disabled = false;
+      submitButton.textContent = originalButtonText;
+    }
+    return;
+  }
+  
   try {
     const res = await fetch('/api/v1/users', {
       method: 'POST',
@@ -567,18 +605,41 @@ async function createUser(e) {
     
     if (res.ok || res.status === 201) {
       console.log('User created successfully, refreshing list...');
-      closeModal('create-user-modal');
+      // Reset form before closing modal
       e.target.reset();
+      closeModal('create-user-modal');
       // Force reload users list - add cache busting
       await loadUsers(true);
       alert('User created successfully');
     } else {
-      const errorMsg = (data && data.error) ? data.error : 'Failed to create user';
+      // Extract error message from different possible formats
-      console.error('Create user failed:', errorMsg);
+      let errorMsg = 'Failed to create user';
+      if (data) {
+        // Try structured error format: {code, message, details}
+        if (data.message) {
+          errorMsg = data.message;
+          // Append details if available
+          if (data.details) {
+            errorMsg += ': ' + data.details;
+          }
+        } 
+        // Fallback to simple error format: {error}
+        else if (data.error) {
+          errorMsg = data.error;
+        }
+      }
+      console.error('Create user failed:', errorMsg, data);
       alert(`Error: ${errorMsg}`);
     }
   } catch (err) {
     alert(`Error: ${err.message}`);
+  } finally {
+    // Re-enable submit button
+    isCreatingUser = false;
+    if (submitButton) {
+      submitButton.disabled = false;
+      submitButton.textContent = originalButtonText;
+    }
   }
 }
 

web/templates/storage.html

@@ -335,8 +335,50 @@
       window.location.href = '/login?return=' + encodeURIComponent(window.location.pathname);
       return;
     }
+    
+    // Hide create/update/delete buttons for viewer role
+    hideButtonsForViewer();
   })();
 
+  // Get current user role
+  function getCurrentUserRole() {
+    try {
+      const userStr = localStorage.getItem('atlas_user');
+      if (userStr) {
+        const user = JSON.parse(userStr);
+        return (user.role || '').toLowerCase();
+      }
+    } catch (e) {
+      console.error('Error parsing user data:', e);
+    }
+    return '';
+  }
+
+  // Check if current user is viewer
+  function isViewer() {
+    return getCurrentUserRole() === 'viewer';
+  }
+
+  // Hide create/update/delete buttons for viewer role
+  function hideButtonsForViewer() {
+    if (isViewer()) {
+      // Hide create buttons
+      const createButtons = document.querySelectorAll('button[onclick*="showCreate"], button[onclick*="Create"], button[onclick*="Import"]');
+      createButtons.forEach(btn => {
+        if (btn.onclick && (btn.onclick.toString().includes('Create') || btn.onclick.toString().includes('Import'))) {
+          btn.style.display = 'none';
+        }
+      });
+      // Also hide by text content
+      document.querySelectorAll('button').forEach(btn => {
+        const text = btn.textContent || '';
+        if (text.includes('Create') || text.includes('Import')) {
+          btn.style.display = 'none';
+        }
+      });
+    }
+  }
+
 let currentTab = 'pools';
 
 function switchTab(tab) {

web/templates/vtl.html

@@ -76,7 +76,10 @@
           <h2 class="text-lg font-semibold text-white">Virtual Tape Drives</h2>
           <p class="text-xs text-slate-400 mt-1">Manage tape drives and loaded media</p>
         </div>
-        <button onclick="loadVTLDrives()" class="text-sm text-slate-400 hover:text-white">Refresh</button>
+        <div class="flex gap-2">
+          <button onclick="showCreateDriveModal()" class="px-3 py-1.5 bg-blue-600 hover:bg-blue-700 text-white rounded text-sm">Add Drive</button>
+          <button onclick="loadVTLDrives()" class="text-sm text-slate-400 hover:text-white">Refresh</button>
+        </div>
       </div>
       <div id="vtl-drives-list" class="p-4">
         <p class="text-slate-400 text-sm">Loading...</p>
@@ -112,7 +115,12 @@
           <h2 class="text-lg font-semibold text-white">Media Changer</h2>
           <p class="text-xs text-slate-400 mt-1">Manage tape library slots and operations</p>
         </div>
-        <button onclick="loadMediaChanger()" class="text-sm text-slate-400 hover:text-white">Refresh</button>
+        <div class="flex gap-2">
+          <button onclick="showCreateChangerModal()" id="create-changer-btn" class="px-3 py-1.5 bg-blue-600 hover:bg-blue-700 text-white rounded text-sm">
+            Add Media Changer
+          </button>
+          <button onclick="loadMediaChanger()" class="text-sm text-slate-400 hover:text-white">Refresh</button>
+        </div>
       </div>
       <div id="vtl-changer-content" class="p-4">
         <p class="text-slate-400 text-sm">Loading...</p>
@@ -228,6 +236,107 @@
   </div>
 </div>
 
+<!-- Create/Edit Media Changer Modal -->
+<div id="changer-modal" class="hidden fixed inset-0 bg-black/50 flex items-center justify-center z-50">
+  <div class="bg-slate-800 rounded-lg border border-slate-700 p-6 max-w-md w-full mx-4">
+    <h3 id="changer-modal-title" class="text-xl font-semibold text-white mb-4">Add Media Changer</h3>
+    <form id="changer-form" onsubmit="saveChanger(event)" class="space-y-4">
+      <input type="hidden" id="changer-library-id">
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Library ID *</label>
+        <input type="number" id="changer-id-input" name="library_id" min="1" required class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Unique library identifier (e.g., 10, 20, 30)</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Vendor</label>
+        <input type="text" id="changer-vendor-input" name="vendor" placeholder="STK" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Default: STK</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Product</label>
+        <input type="text" id="changer-product-input" name="product" placeholder="L700 or L80" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Default: L700 (or L80 for library 30)</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Serial Number</label>
+        <input type="text" id="changer-serial-input" name="serial" placeholder="Auto-generated" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Leave empty for auto-generation</p>
+      </div>
+      <div id="changer-slots-div">
+        <label class="block text-sm font-medium text-slate-300 mb-1">Number of Slots</label>
+        <input type="number" id="changer-slots-input" name="num_slots" min="1" value="10" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Default: 10 slots</p>
+      </div>
+      <div class="flex gap-2 justify-end">
+        <button type="button" onclick="closeModal('changer-modal')" class="px-4 py-2 bg-slate-700 hover:bg-slate-600 text-white rounded text-sm">
+          Cancel
+        </button>
+        <button type="submit" class="px-4 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded text-sm">
+          Save
+        </button>
+      </div>
+    </form>
+  </div>
+</div>
+
+<!-- Create/Edit Drive Modal -->
+<div id="drive-modal" class="hidden fixed inset-0 bg-black/50 flex items-center justify-center z-50">
+  <div class="bg-slate-800 rounded-lg border border-slate-700 p-6 max-w-md w-full mx-4">
+    <h3 id="drive-modal-title" class="text-xl font-semibold text-white mb-4">Add Drive</h3>
+    <form id="drive-form" onsubmit="saveDrive(event)" class="space-y-4">
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Drive ID *</label>
+        <input type="number" id="drive-id-input" name="drive_id" min="1" required class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Unique drive identifier (e.g., 11, 12, 21)</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Library ID *</label>
+        <input type="number" id="drive-library-id-input" name="library_id" min="1" required class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Library where this drive belongs</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Slot ID *</label>
+        <input type="number" id="drive-slot-id-input" name="slot_id" min="1" required class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Slot number in the library</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Vendor</label>
+        <select id="drive-vendor-input" name="vendor" onchange="updateDriveProductOptions()" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+          <option value="IBM">IBM</option>
+          <option value="HP">HP</option>
+          <option value="Quantum">Quantum</option>
+          <option value="Tandberg">Tandberg</option>
+          <option value="Overland">Overland</option>
+        </select>
+        <p class="text-xs text-slate-400 mt-1">Select drive vendor</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Product (LTO Drive Type)</label>
+        <select id="drive-product-input" name="product" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+          <option value="ULT3580-TD5">IBM ULT3580-TD5 (LTO-5)</option>
+          <option value="ULT3580-TD6">IBM ULT3580-TD6 (LTO-6)</option>
+          <option value="ULT3580-TD7">IBM ULT3580-TD7 (LTO-7)</option>
+          <option value="ULT3580-TD8">IBM ULT3580-TD8 (LTO-8)</option>
+        </select>
+        <p class="text-xs text-slate-400 mt-1">Select LTO drive generation</p>
+      </div>
+      <div>
+        <label class="block text-sm font-medium text-slate-300 mb-1">Serial Number</label>
+        <input type="text" id="drive-serial-input" name="serial" placeholder="Auto-generated" class="w-full px-3 py-2 bg-slate-900 border border-slate-700 rounded text-white text-sm focus:outline-none focus:ring-2 focus:ring-blue-600">
+        <p class="text-xs text-slate-400 mt-1">Leave empty for auto-generation</p>
+      </div>
+      <div class="flex gap-2 justify-end">
+        <button type="button" onclick="closeModal('drive-modal')" class="px-4 py-2 bg-slate-700 hover:bg-slate-600 text-white rounded text-sm">
+          Cancel
+        </button>
+        <button type="submit" class="px-4 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded text-sm">
+          Save
+        </button>
+      </div>
+    </form>
+  </div>
+</div>
+
 <!-- Service Control Modal -->
 <div id="service-control-modal" class="hidden fixed inset-0 bg-black/50 flex items-center justify-center z-50">
   <div class="bg-slate-800 rounded-lg border border-slate-700 p-6 max-w-md w-full mx-4">
@@ -263,8 +372,49 @@
       window.location.href = '/login?return=' + encodeURIComponent(window.location.pathname);
       return;
     }
+    
+    // Hide create/update/delete buttons for viewer role
+    hideButtonsForViewer();
   })();
 
+  // Get current user role
+  function getCurrentUserRole() {
+    try {
+      const userStr = localStorage.getItem('atlas_user');
+      if (userStr) {
+        const user = JSON.parse(userStr);
+        return (user.role || '').toLowerCase();
+      }
+    } catch (e) {
+      console.error('Error parsing user data:', e);
+    }
+    return '';
+  }
+
+  // Check if current user is viewer
+  function isViewer() {
+    return getCurrentUserRole() === 'viewer';
+  }
+
+  // Hide create/update/delete buttons for viewer role
+  function hideButtonsForViewer() {
+    if (isViewer()) {
+      // Hide create/control buttons
+      document.querySelectorAll('button').forEach(btn => {
+        const text = btn.textContent || '';
+        const onclick = btn.getAttribute('onclick') || '';
+        if (text.includes('Create') || text.includes('Service Control') || text.includes('Add') ||
+            (text.includes('Edit') && !text.includes('Refresh')) || text.includes('Delete') ||
+            onclick.includes('showCreate') || onclick.includes('showServiceControl') ||
+            onclick.includes('showCreateChanger') || onclick.includes('showEditChanger') ||
+            onclick.includes('deleteChanger') || onclick.includes('showCreateDriveModal') ||
+            onclick.includes('showEditDriveModal') || onclick.includes('deleteDrive')) {
+          btn.style.display = 'none';
+        }
+      });
+    }
+  }
+
   function getAuthHeaders() {
     const token = localStorage.getItem('atlas_token');
     return {
@@ -342,7 +492,11 @@
   // Load Drives
   async function loadVTLDrives() {
     try {
-      const res = await fetch('/api/v1/vtl/drives', { headers: getAuthHeaders() });
+      // Add cache busting to ensure fresh data
+      const res = await fetch('/api/v1/vtl/drives?_=' + Date.now(), { 
+        headers: getAuthHeaders(),
+        cache: 'no-cache'
+      });
       if (!res.ok) throw new Error('Failed to load drives');
       
       const drives = await res.json();
@@ -380,6 +534,8 @@
               ${drive.media_loaded 
                 ? `<button onclick="ejectTape(${drive.id})" class="px-3 py-1.5 bg-yellow-600 hover:bg-yellow-700 text-white rounded text-sm">Eject</button>`
                 : `<button onclick="loadTape(${drive.id})" class="px-3 py-1.5 bg-blue-600 hover:bg-blue-700 text-white rounded text-sm">Load Tape</button>`}
+              <button onclick="showEditDriveModal(${drive.id})" class="px-3 py-1.5 bg-slate-600 hover:bg-slate-700 text-white rounded text-sm">Edit</button>
+              <button onclick="deleteDrive(${drive.id})" class="px-3 py-1.5 bg-red-600 hover:bg-red-700 text-white rounded text-sm">Delete</button>
             </div>
           </div>
         </div>
@@ -449,7 +605,12 @@
   // Load Media Changer
   async function loadMediaChanger() {
     try {
-      const res = await fetch('/api/v1/vtl/changer/status', { headers: getAuthHeaders() });
+      // Use /api/v1/vtl/changers instead of /api/v1/vtl/changer/status for better consistency
+      // Add cache busting to force refresh
+      const res = await fetch('/api/v1/vtl/changers?t=' + Date.now(), { 
+        headers: getAuthHeaders(),
+        cache: 'no-cache'
+      });
       const changerEl = document.getElementById('vtl-changer-content');
       
       if (!res.ok) {
@@ -478,17 +639,29 @@
       
       changerEl.innerHTML = changerList.map(changer => `
         <div class="bg-slate-900 rounded-lg p-6 border border-slate-700 mb-4">
-          <div class="flex items-center justify-between mb-4">
+          <div class="flex items-start justify-between">
-            <h3 class="text-lg font-semibold text-white">Media Changer ${changer.id || 'N/A'}</h3>
+            <div class="flex-1">
-            ${changer.status === 'online' 
+              <div class="flex items-center gap-2 mb-4">
-              ? '<span class="px-2 py-1 rounded text-xs font-medium bg-green-900 text-green-300">Online</span>' 
+                <h3 class="text-lg font-semibold text-white">Media Changer ${changer.id || changer.library_id || 'N/A'}</h3>
-              : '<span class="px-2 py-1 rounded text-xs font-medium bg-red-900 text-red-300">Offline</span>'}
+                ${changer.status === 'online' 
-          </div>
+                  ? '<span class="px-2 py-1 rounded text-xs font-medium bg-green-900 text-green-300">Online</span>' 
-          <div class="text-sm text-slate-400 space-y-2">
+                  : '<span class="px-2 py-1 rounded text-xs font-medium bg-red-900 text-red-300">Offline</span>'}
-            <p><span class="text-slate-300">Device:</span> ${changer.device || 'N/A'}</p>
+              </div>
-            <p><span class="text-slate-300">Library ID:</span> ${changer.library_id || 'N/A'}</p>
+              <div class="text-sm text-slate-400 space-y-2">
-            <p><span class="text-slate-300">Slots:</span> ${changer.slots || 0}</p>
+                <p><span class="text-slate-300">Device:</span> <span class="text-slate-400 font-mono">${changer.device || 'N/A'}</span></p>
-            <p><span class="text-slate-300">Drives:</span> ${changer.drives || 0}</p>
+                <p><span class="text-slate-300">Library ID:</span> <span class="text-slate-400">${changer.library_id || changer.id || 'N/A'}</span></p>
+                <p><span class="text-slate-300">Slots:</span> <span class="text-slate-400">${changer.slots || 0}</span></p>
+                <p><span class="text-slate-300">Drives:</span> <span class="text-slate-400">${changer.drives || 0}</span></p>
+              </div>
+            </div>
+            <div class="flex gap-2 ml-4">
+              <button onclick="showEditChangerModal(${changer.library_id || changer.id})" class="px-3 py-1.5 bg-blue-600 hover:bg-blue-700 text-white rounded text-sm">
+                Edit
+              </button>
+              <button onclick="deleteChanger(${changer.library_id || changer.id})" class="px-3 py-1.5 bg-red-600 hover:bg-red-700 text-white rounded text-sm">
+                Delete
+              </button>
+            </div>
           </div>
         </div>
       `).join('');
@@ -833,6 +1006,324 @@
     document.getElementById(modalId).classList.add('hidden');
   }
 
+  // Media Changer Management Functions
+  function showCreateChangerModal() {
+    document.getElementById('changer-modal-title').textContent = 'Add Media Changer';
+    document.getElementById('changer-form').reset();
+    document.getElementById('changer-library-id').value = '';
+    document.getElementById('changer-id-input').removeAttribute('readonly');
+    document.getElementById('changer-id-input').disabled = false;
+    document.getElementById('changer-slots-div').style.display = 'block';
+    document.getElementById('changer-modal').classList.remove('hidden');
+  }
+
+  function showEditChangerModal(libraryID) {
+    document.getElementById('changer-modal-title').textContent = 'Edit Media Changer';
+    document.getElementById('changer-form').reset();
+    document.getElementById('changer-library-id').value = libraryID;
+    document.getElementById('changer-id-input').value = libraryID;
+    document.getElementById('changer-id-input').setAttribute('readonly', 'readonly');
+    document.getElementById('changer-id-input').disabled = true;
+    document.getElementById('changer-slots-div').style.display = 'none';
+    
+    // Load current changer data
+    fetch(`/api/v1/vtl/changers/${libraryID}`, { headers: getAuthHeaders() })
+      .then(res => res.json())
+      .then(changer => {
+        if (changer.library_id || changer.id) {
+          document.getElementById('changer-vendor-input').value = changer.vendor || 'STK';
+          document.getElementById('changer-product-input').value = changer.product || '';
+          document.getElementById('changer-serial-input').value = changer.serial || '';
+        }
+      })
+      .catch(err => {
+        console.error('Error loading changer data:', err);
+      });
+    
+    document.getElementById('changer-modal').classList.remove('hidden');
+  }
+
+  async function saveChanger(e) {
+    e.preventDefault();
+    const formData = new FormData(e.target);
+    // Get library_id directly from the visible input field (not from FormData to avoid conflict with hidden input)
+    const libraryIDInput = document.getElementById('changer-id-input');
+    const libraryID = libraryIDInput ? parseInt(libraryIDInput.value) : parseInt(formData.get('library_id'));
+    const isEdit = document.getElementById('changer-library-id').value !== '';
+    
+    // Validate library ID
+    if (!libraryID || libraryID <= 0 || isNaN(libraryID)) {
+      alert('Error: Library ID must be a valid number greater than 0');
+      return;
+    }
+    
+    const data = {
+      library_id: libraryID,
+      vendor: formData.get('vendor') || '',
+      product: formData.get('product') || '',
+      serial: formData.get('serial') || '',
+    };
+    
+    if (!isEdit) {
+      const numSlotsInput = document.getElementById('changer-slots-input');
+      data.num_slots = numSlotsInput ? parseInt(numSlotsInput.value) : parseInt(formData.get('num_slots')) || 10;
+    }
+
+    try {
+      let res;
+      if (isEdit) {
+        res = await fetch(`/api/v1/vtl/changers/${libraryID}`, {
+          method: 'PUT',
+          headers: getAuthHeaders(),
+          body: JSON.stringify(data)
+        });
+      } else {
+        res = await fetch('/api/v1/vtl/changers', {
+          method: 'POST',
+          headers: getAuthHeaders(),
+          body: JSON.stringify(data)
+        });
+      }
+
+      const result = await res.json().catch(() => null);
+      
+      if (res.ok) {
+        closeModal('changer-modal');
+        // Wait a moment for backend to finish writing file
+        await new Promise(resolve => setTimeout(resolve, 500));
+        // Force refresh with cache busting
+        await loadMediaChanger();
+        await refreshVTLStatus();
+        alert(isEdit ? 'Media changer updated successfully' : 'Media changer created successfully');
+      } else {
+        const errorMsg = (result && result.message) ? result.message : 'Failed to save media changer';
+        alert(`Error: ${errorMsg}`);
+      }
+    } catch (err) {
+      alert(`Error: ${err.message}`);
+    }
+  }
+
+  async function deleteChanger(libraryID) {
+    if (!confirm(`Are you sure you want to delete media changer Library ${libraryID}? This will also remove all associated drives.`)) {
+      return;
+    }
+
+    try {
+      const res = await fetch(`/api/v1/vtl/changers/${libraryID}`, {
+        method: 'DELETE',
+        headers: getAuthHeaders()
+      });
+
+      const result = await res.json().catch(() => null);
+      
+      if (res.ok) {
+        alert('Media changer deleted successfully');
+        loadMediaChanger();
+        refreshVTLStatus();
+      } else {
+        const errorMsg = (result && result.message) ? result.message : 'Failed to delete media changer';
+        alert(`Error: ${errorMsg}`);
+      }
+    } catch (err) {
+      alert(`Error: ${err.message}`);
+    }
+  }
+
+  // Drive product options by vendor
+  const driveProducts = {
+    'IBM': [
+      { value: 'ULT3580-TD5', label: 'ULT3580-TD5 (LTO-5)' },
+      { value: 'ULT3580-TD6', label: 'ULT3580-TD6 (LTO-6)' },
+      { value: 'ULT3580-TD7', label: 'ULT3580-TD7 (LTO-7)' },
+      { value: 'ULT3580-TD8', label: 'ULT3580-TD8 (LTO-8)' }
+    ],
+    'HP': [
+      { value: 'HP LTO-5', label: 'HP LTO-5' },
+      { value: 'HP LTO-6', label: 'HP LTO-6' },
+      { value: 'HP LTO-7', label: 'HP LTO-7' },
+      { value: 'HP LTO-8', label: 'HP LTO-8' }
+    ],
+    'Quantum': [
+      { value: 'Quantum LTO-5', label: 'Quantum LTO-5' },
+      { value: 'Quantum LTO-6', label: 'Quantum LTO-6' },
+      { value: 'Quantum LTO-7', label: 'Quantum LTO-7' },
+      { value: 'Quantum LTO-8', label: 'Quantum LTO-8' }
+    ],
+    'Tandberg': [
+      { value: 'Tandberg LTO-5', label: 'Tandberg LTO-5' },
+      { value: 'Tandberg LTO-6', label: 'Tandberg LTO-6' },
+      { value: 'Tandberg LTO-7', label: 'Tandberg LTO-7' },
+      { value: 'Tandberg LTO-8', label: 'Tandberg LTO-8' }
+    ],
+    'Overland': [
+      { value: 'Overland LTO-5', label: 'Overland LTO-5' },
+      { value: 'Overland LTO-6', label: 'Overland LTO-6' },
+      { value: 'Overland LTO-7', label: 'Overland LTO-7' },
+      { value: 'Overland LTO-8', label: 'Overland LTO-8' }
+    ]
+  };
+
+  function updateDriveProductOptions() {
+    const vendorSelect = document.getElementById('drive-vendor-input');
+    const productSelect = document.getElementById('drive-product-input');
+    const vendor = vendorSelect.value;
+    
+    // Clear existing options
+    productSelect.innerHTML = '';
+    
+    // Add options for selected vendor
+    if (driveProducts[vendor]) {
+      driveProducts[vendor].forEach(product => {
+        const option = document.createElement('option');
+        option.value = product.value;
+        option.textContent = product.label;
+        productSelect.appendChild(option);
+      });
+    }
+  }
+
+  // Drive Management Functions
+  function showCreateDriveModal() {
+    document.getElementById('drive-modal-title').textContent = 'Add Drive';
+    document.getElementById('drive-form').reset();
+    document.getElementById('drive-id-input').removeAttribute('readonly');
+    document.getElementById('drive-id-input').disabled = false;
+    // Set default vendor to IBM
+    document.getElementById('drive-vendor-input').value = 'IBM';
+    updateDriveProductOptions();
+    document.getElementById('drive-modal').classList.remove('hidden');
+  }
+
+  async function showEditDriveModal(driveID) {
+    try {
+      const res = await fetch(`/api/v1/vtl/drives/${driveID}`, { headers: getAuthHeaders() });
+      if (!res.ok) throw new Error('Failed to load drive');
+      
+      const drive = await res.json();
+      
+      document.getElementById('drive-modal-title').textContent = 'Edit Drive';
+      document.getElementById('drive-id-input').value = drive.id;
+      document.getElementById('drive-id-input').setAttribute('readonly', 'readonly');
+      document.getElementById('drive-id-input').disabled = true;
+      document.getElementById('drive-library-id-input').value = drive.library_id || '';
+      document.getElementById('drive-slot-id-input').value = drive.slot_id || '';
+      
+      // Set vendor and update product options
+      const vendor = drive.vendor || 'IBM';
+      document.getElementById('drive-vendor-input').value = vendor;
+      updateDriveProductOptions();
+      
+      // Set product (try to match existing value or default to first option)
+      const productSelect = document.getElementById('drive-product-input');
+      const product = drive.product || '';
+      if (product) {
+        // Try to find matching option
+        let found = false;
+        for (let i = 0; i < productSelect.options.length; i++) {
+          if (productSelect.options[i].value === product) {
+            productSelect.value = product;
+            found = true;
+            break;
+          }
+        }
+        // If not found, add it as a custom option
+        if (!found) {
+          const option = document.createElement('option');
+          option.value = product;
+          option.textContent = product + ' (Custom)';
+          option.selected = true;
+          productSelect.appendChild(option);
+        }
+      }
+      
+      document.getElementById('drive-serial-input').value = drive.serial || '';
+      
+      document.getElementById('drive-modal').classList.remove('hidden');
+    } catch (err) {
+      alert(`Error: ${err.message}`);
+    }
+  }
+
+  async function saveDrive(event) {
+    event.preventDefault();
+    
+    const formData = new FormData(event.target);
+    const driveID = parseInt(document.getElementById('drive-id-input').value);
+    const isEdit = document.getElementById('drive-id-input').hasAttribute('readonly');
+    
+    const data = {
+      drive_id: driveID,
+      library_id: parseInt(document.getElementById('drive-library-id-input').value),
+      slot_id: parseInt(document.getElementById('drive-slot-id-input').value),
+      vendor: document.getElementById('drive-vendor-input').value || '',
+      product: document.getElementById('drive-product-input').value || '',
+      serial: document.getElementById('drive-serial-input').value || ''
+    };
+
+    try {
+      let res;
+      if (isEdit) {
+        res = await fetch(`/api/v1/vtl/drives/${driveID}`, {
+          method: 'PUT',
+          headers: getAuthHeaders(),
+          body: JSON.stringify(data)
+        });
+      } else {
+        res = await fetch('/api/v1/vtl/drives', {
+          method: 'POST',
+          headers: getAuthHeaders(),
+          body: JSON.stringify(data)
+        });
+      }
+
+      const result = await res.json().catch(() => null);
+      
+      if (res.ok) {
+        closeModal('drive-modal');
+        // Wait a moment for backend to finish writing file
+        await new Promise(resolve => setTimeout(resolve, 1000));
+        // Force refresh with cache busting
+        await loadVTLDrives();
+        await refreshVTLStatus();
+        alert(isEdit ? 'Drive updated successfully' : 'Drive created successfully');
+      } else {
+        const errorMsg = (result && result.message) ? result.message : 'Failed to save drive';
+        alert(`Error: ${errorMsg}`);
+      }
+    } catch (err) {
+      alert(`Error: ${err.message}`);
+    }
+  }
+
+  async function deleteDrive(driveID) {
+    if (!confirm(`Are you sure you want to delete Drive ${driveID}?`)) {
+      return;
+    }
+
+    try {
+      const res = await fetch(`/api/v1/vtl/drives/${driveID}`, {
+        method: 'DELETE',
+        headers: getAuthHeaders()
+      });
+
+      const result = await res.json().catch(() => null);
+      
+      if (res.ok) {
+        alert('Drive deleted successfully');
+        // Wait a moment for backend to finish writing file
+        await new Promise(resolve => setTimeout(resolve, 500));
+        loadVTLDrives();
+        refreshVTLStatus();
+      } else {
+        const errorMsg = (result && result.message) ? result.message : 'Failed to delete drive';
+        alert(`Error: ${errorMsg}`);
+      }
+    } catch (err) {
+      alert(`Error: ${err.message}`);
+    }
+  }
+
   // Update Media Changer Status in dashboard
   async function updateMediaChangerStatus() {
     try {