# RAID Module Development Progress

## Date: 2026-05-17
## Status: Phase 1 (30% Complete)

## Completed

### Core Module Structure
- ✅ `src/raid/mod.rs` - Core interface and enums
- ✅ `src/raid/controller.rs` - RAID controller and array management
- ✅ `src/raid/level_0.rs` - RAID 0 Stripe algorithm
- ✅ `src/raid/level_1.rs` - RAID 1 Mirror algorithm
- ✅ `src/raid/level_5.rs` - RAID 5 placeholder (stub)

### Implemented Features
- ✅ RaidLevel enum (0/1/5/6/10/50/60)
- ✅ MemberStatus enum (Online/Offline/Rebuilding/Failed)
- ✅ RaidAlgorithm trait (read/write interface)
- ✅ RaidController (create_array/read/write)
- ✅ RAID 0 Stripe: locate_block algorithm
- ✅ RAID 1 Mirror: read from first member, write to all

### Test Infrastructure
- ✅ Test program: `src/bin/raid_test.rs`
- ✅ Test disks: 3 × 5GB sparseimage
- ✅ Compilation successful

## Pending

### Week 2: RAID 5/6
- ❌ XOR Parity calculation (parity.rs)
- ❌ RAID 5 rotating parity position
- ❌ RAID 5 reconstruction
- ❌ Reed-Solomon library (RAID 6)
- ❌ RAID 6 double parity

### Week 3: Nested RAID
- ❌ RAID 10 (Mirror + Stripe)
- ❌ RAID 50 (RAID 5 + Stripe)
- ❌ RAID 60 (RAID 6 + Stripe)

### Week 4: Integration
- ❌ WebDAV handler integration
- ❌ Single RAID device export
- ❌ Performance testing (AJA)
- ❌ Fault simulation

## Architecture

```
RaidController
├── RaidArray {level, members, stripe_size}
└── RaidAlgorithm trait
    ├── Raid0.read/write (Stripe)
    ├── Raid1.read/write (Mirror)
    ├── Raid5.read/write (Parity)
    ├── Raid6.read/write (Double Parity)
    └── Nested RAID implementations
```

## Performance Target

- RAID 0: >=600 MB/s (3盘叠加)
- RAID 5: >=500 MB/s (校验开销)
- RAID 6: >=400 MB/s (双校验开销)

## Next Steps

1. Implement parity.rs (XOR calculation)
2. Complete RAID 5 read/write logic
3. Add Reed-Solomon library for RAID 6
4. Test fault recovery

