Organize documentation: move all markdown files to docs/ directory
- Created docs/ directory for better organization - Moved 35 markdown files from root to docs/ - Includes all status reports, guides, and testing documentation Co-Authored-By: Warp <agent@warp.dev>
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Warp Agent
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docs/VTL-IMPLEMENTATION-COMPLETE.md
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docs/VTL-IMPLEMENTATION-COMPLETE.md
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# Virtual Tape Library (VTL) Implementation - Complete
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## ✅ Implementation Summary
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The Virtual Tape Library component has been successfully implemented with full CRUD operations, tape management, and database persistence.
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## 📦 Components Implemented
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### 1. VTL Service (`backend/internal/tape_vtl/service.go`)
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**Core Functionality:**
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- **Library Management**:
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- Create virtual tape libraries with configurable slots and drives
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- List and retrieve libraries
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- Delete libraries (with safety checks)
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- Automatic backing store directory creation
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- MHVTL library ID assignment
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- **Tape Management**:
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- Create virtual tapes with barcode, slot assignment, and size
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- List tapes for a library
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- Track tape status (idle, in_drive, exported)
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- Tape image file creation and management
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- **Drive Management**:
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- Automatic drive creation when library is created
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- Drive status tracking (idle, ready, error)
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- Current tape tracking per drive
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- **Operations**:
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- Load tape from slot to drive (async)
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- Unload tape from drive to slot (async)
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- Database state synchronization
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### 2. VTL Handler (`backend/internal/tape_vtl/handler.go`)
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**API Endpoints:**
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- `GET /api/v1/tape/vtl/libraries` - List all VTL libraries
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- `POST /api/v1/tape/vtl/libraries` - Create new VTL library
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- `GET /api/v1/tape/vtl/libraries/:id` - Get library with drives and tapes
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- `DELETE /api/v1/tape/vtl/libraries/:id` - Delete library
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- `GET /api/v1/tape/vtl/libraries/:id/drives` - List drives
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- `GET /api/v1/tape/vtl/libraries/:id/tapes` - List tapes
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- `POST /api/v1/tape/vtl/libraries/:id/tapes` - Create new tape
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- `POST /api/v1/tape/vtl/libraries/:id/load` - Load tape (async)
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- `POST /api/v1/tape/vtl/libraries/:id/unload` - Unload tape (async)
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### 3. Router Integration
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All endpoints are wired with:
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- ✅ RBAC middleware (requires `tape:read` permission)
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- ✅ Audit logging (all mutating operations)
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- ✅ Async task support for load/unload operations
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## 🎯 Features
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### Library Creation
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- Creates backing store directory structure
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- Generates unique MHVTL library IDs
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- Automatically creates virtual drives (1-8 max)
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- Creates initial tapes in all slots with auto-generated barcodes
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- Default tape size: 800 GB (LTO-8)
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### Tape Management
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- Barcode-based identification
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- Slot assignment and tracking
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- Tape image files stored on disk
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- Size and usage tracking
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- Status tracking (idle, in_drive, exported)
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### Load/Unload Operations
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- Async task execution
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- Database state updates
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- Drive status management
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- Tape status updates
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## 📁 Directory Structure
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When a VTL library is created:
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```
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/var/lib/calypso/vtl/<library_name>/
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└── tapes/
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├── V00001.img
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├── V00002.img
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└── ...
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```
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## 🔄 Database Schema
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Uses existing tables from migration 002:
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- `virtual_tape_libraries` - Library metadata
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- `virtual_tape_drives` - Drive information
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- `virtual_tapes` - Tape inventory
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## 🧪 Testing
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### Create a VTL Library:
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```bash
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curl -X POST http://localhost:8080/api/v1/tape/vtl/libraries \
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-H "Authorization: Bearer $TOKEN" \
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-H "Content-Type: application/json" \
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-d '{
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"name": "vtl01",
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"description": "Test VTL Library",
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"backing_store_path": "/var/lib/calypso/vtl",
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"slot_count": 10,
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"drive_count": 2
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}'
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```
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### List Libraries:
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```bash
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curl http://localhost:8080/api/v1/tape/vtl/libraries \
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-H "Authorization: Bearer $TOKEN"
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```
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### Load a Tape:
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```bash
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curl -X POST http://localhost:8080/api/v1/tape/vtl/libraries/{id}/load \
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-H "Authorization: Bearer $TOKEN" \
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-H "Content-Type: application/json" \
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-d '{
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"slot_number": 1,
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"drive_number": 1
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}'
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```
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## 📝 Notes
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### Current Implementation Status
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✅ **Complete:**
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- Library CRUD operations
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- Tape management
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- Load/unload operations
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- Database persistence
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- Async task support
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- Backing store management
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⏳ **Future Enhancements:**
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- MHVTL service integration (create actual MHVTL config)
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- Device discovery and udev rule generation
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- SCST export integration (automatic target creation)
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- Tape image file I/O operations
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- Barcode validation and uniqueness checks
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### MHVTL Integration
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The current implementation provides the **database and API layer** for VTL management. Full MHVTL integration would require:
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1. MHVTL installation and configuration
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2. MHVTL config file generation
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3. Device node discovery after MHVTL creates devices
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4. udev rule generation for stable device paths
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5. SCST target creation for discovered devices
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This can be added as a separate enhancement when MHVTL is installed.
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## 🎉 Status
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**Virtual Tape Library component is complete and ready for testing!**
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All endpoints are functional and can be tested immediately. The implementation provides a solid foundation for MHVTL integration when needed.
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---
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**Next Steps:**
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- Test VTL endpoints
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- Optionally: Add MHVTL service integration
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- Optionally: Add SCST export automation for VTL libraries
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- Continue with Enhanced Monitoring component
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