Btrfs Profile#

Btrfs filesystem management with snapshots, scrubbing, and optional deduplication.

Usage#

{
  myNixOS.profiles.btrfs = {
    enable = true;
    snapshots = false;
    deduplicate = false; # optional, enables beesd
  };
}

What It Does#

• Filesystem support: Enables btrfs kernel support.
• Auto-scrubbing: Periodic data integrity checks on all btrfs filesystems.
• Snapshots: Automatic timeline snapshots of /home with snapper (if btrfs subvolume).
• Smart filtering: Excludes cache, config, and temporary files from snapshots.
• Deduplication: Optional beesd for block-level deduplication (when enabled).
• GUI tools: Includes snapper-gui on desktop systems.

Snapshot Configuration#

• Timeline snapshots: Automatic creation and cleanup enabled.
• User access: Users group can manage their own snapshots.
• Filtered paths: Excludes .cache, .config, .local, browser profiles, etc.

Deduplication (Optional)#

When deduplicate = true:

• beesd: Runs with 2GB hash tables and conservative load targets.
• Performance tuning: Limited to 50% thread factor and 1.0 load average.
• Auto-discovery: Automatically configures all detected btrfs devices.

Important Notes#

Only activates features for detected btrfs filesystems. Snapper only configured if /home is a btrfs subvolume.