Open-Source Storage & Redundancy Systems

Your storage architecture dictates whether your system actively repairs silent bit rot or serves corrupted data.

Storage Engine Comparison

Deep Dive: SnapRAID + MergerFS

For digital preservation where files are written once and read occasionally, SnapRAID combined with MergerFS provides key advantages over real-time RAID:

• Drive Spin-Down: Disks remain spun down until a specific file on that drive is requested.
• Independent Filesystems: Every disk uses a standard Linux filesystem (ext4/XFS). If drive failures exceed parity capacity, uninjured disks remain 100% readable.
• Mixed Drive Capacities: Easily mix older and newer drives as your pool grows.

Configuration Snippet (/etc/snapraid.conf)

# Location of parity file (must reside on your largest disk)
parity /mnt/parity1/snapraid.parity

# Content metadata locations
content /var/snapraid/snapraid.content
content /mnt/disk1/snapraid.content
content /mnt/disk2/snapraid.content

# Data drives to protect
data d1 /mnt/disk1/
data d2 /mnt/disk2/

# Exclude temporary or system folders
exclude /tmp/
exclude /lost+found/
exclude *.tmp

Automated Scrub Routine

# Sync filesystem changes to parity
snapraid sync

# Scrub 8% of the array, targeting data older than 10 days
snapraid scrub -p 8 -o 10

Offsite Backup Engine Comparison