MajorLinux
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71 lines
2.0 KiB
Markdown
71 lines
2.0 KiB
Markdown
# SnapRAID & MergerFS Storage Setup
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## Problem
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Managing a collection of mismatched hard drives as a single pool while maintaining data redundancy (parity) without the overhead or risk of a traditional RAID 5/6 array.
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## Solution
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A combination of **MergerFS** for pooling and **SnapRAID** for parity. This is ideal for "mostly static" media storage (like MajorRAID) where files aren't changing every second.
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### 1. Concepts
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- **MergerFS:** A FUSE-based union filesystem. It takes multiple drives/folders and presents them as a single mount point. It does NOT provide redundancy.
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- **SnapRAID:** A backup/parity tool for disk arrays. It creates parity information on a dedicated drive. It is NOT real-time (you must run `snapraid sync`).
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### 2. Implementation Strategy
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1. **Clean the Pool:** Use `rmlint` to clear duplicates and reclaim space.
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2. **Identify the Parity Drive:** Choose your largest drive (or one equal to the largest data drive) to hold the parity information. In my setup, `/mnt/usb` (sdc) was cleared of 4TB of duplicates to be repurposed for this.
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3. **Configure MergerFS:** Pool the data drives (e.g., `/mnt/disk1`, `/mnt/disk2`) into `/storage`.
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4. **Configure SnapRAID:** Point SnapRAID to the data drives and the parity drive.
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### 3. MergerFS Config (/etc/fstab)
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```fstab
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# Example MergerFS pool
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/mnt/disk*:/mnt/usb-data /storage fuse.mergerfs defaults,allow_other,cache.files=off,use_ino,category.create=mfs,minfreespace=20G,fsname=mergerfsPool 0 0
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```
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### 4. SnapRAID Config (/etc/snapraid.conf)
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```conf
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# Parity file location
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parity /mnt/parity/snapraid.parity
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# Data drives
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content /var/snapraid/snapraid.content
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content /mnt/disk1/.snapraid.content
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content /mnt/disk2/.snapraid.content
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data d1 /mnt/disk1/
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data d2 /mnt/disk2/
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# Exclusions
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exclude /lost+found/
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exclude /tmp/
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exclude .DS_Store
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```
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---
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## Maintenance
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### SnapRAID Sync
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Run this daily (via cron) or after adding large amounts of data:
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```bash
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snapraid sync
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```
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### SnapRAID Scrub
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Run this weekly to check for bitrot:
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```bash
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snapraid scrub
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```
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---
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