Disks

Two disks, both partitioned by nix/hosts/s3-01/disko.nix:

• xvda, 40 GiB — ESP (512 MiB, vfat) plus ext4 root.
• xvdb, 100 GiB — one XFS partition at /var/lib/garage.

XFS is deliberate: Garage's docs recommend it for the data directory and advise against ext4, whose stricter inode limits bite once many objects are stored. Garage checksums its own blocks, so a CoW filesystem buys nothing. Its LMDB metadata is the fragile part, but upstream considers metadata_auto_snapshot_interval a better safeguard than filesystem snapshots.

Both disks sit on the same SSD storage repository (vhost1-ssd2), so there is no SSD/HDD tier to split metadata from data. Filesystems mount by partlabel, not device node.

xvdb is declared in disko.nix, so a reinstall repartitions it and destroys any Garage data. Ordinary applies leave it alone.