FSTAB

This document will describe fstab stanzas for different filesystems and partitions as standardized in Ubuntu across various things that parse/create/install/consume fstab entries.

device specification

• First mention a comment that an install time it pointed at a named thing, i.e. mpatha, VG name + LV name, Cryptsetup name, raid md0, device name hda2. Then fstab line is specific one in the following order of preferences.
• By-path (on s390x only)

  1. On architectures that support useful by-path links, i.e. /dev/disk/by-path/ccw-0.0.154d-part1

• By-id with uuid

  1. Linux RAID /dev/disk/by-id/md-uuid-2df6ae19:d2b8f232:a92a12e1:ff5884f0-part1

  2. LVM /dev/disk/by-id/dm-uuid-LVM-AW4vtN9Nuh503yw4izneqpuLXCui4dVmXUcfJlf355pxKjolkkDmXJhPuJHZmZhI

  3. Multipath /dev/disk/by-id/dm-uuid-part1-mpath-35000c50015ea71ad

  4. LUKS1 /dev/disk/by-id/dm-uuid-CRYPT-LUKS1-85cd9f053c264a9b919a6cf780818425-foobar

  5. LUKS2 /dev/disk/by-id/dm-uuid-CRYPT-LUKS2-85cd9f053c264a9b919a6cf780818425-foobar

  6. bcache /dev/bcache/by-uuid/f36394c0-3cc0-4423-8d6f-ffac130f171a

• By-UUID

  1. Things that have UUID, i.e. ext4 /dev/disk/by-uuid/9958d086-4f20-4807-8976-58807a5bc7e0

• By-partuuid

  1. GPT partition /dev/disk/by-partuuid/1de9150c-fbdf-45a1-9c85-930a9bbb6188

• By-path (on s390x only)

  1. On architectures that support useful by-path links, i.e. /dev/disk/by-path/ccw-0.0.154d-part1

• By-device name

  1. /dev/hda2

fs default options

1. any: discard
2. rootfs: ext4 discard,errors=remount-ro 0 1
3. /boot: ext4 discard,noatime,nodiratime 0 2
4. /boot/efi: vfat umask=0077 0 1

TODO

1. zfs? Just this? pool/path/to/dataset /mountpoint zfs defaults 0 0

2. prioritise by-path on z? => yes

3. btrfs?