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<!-- ZFSNightmaresPorted2Linux, Version: 1, Modified: 2018/12/02, Author: trac -->
# ZFS IS ALL THE RAGE
Zfs is recomended by the UBUNTU team for LXC/LXD and it has its positives but just like everything else the damned kids fixed is pleanty fucking broke. It does not play well with others and it will fuck you in the most subtle and substantial ways.
Look at the disks.
root@bs2020:~# fdisk -l
Disk /dev/sda: 136.8 GiB, 146815733760 bytes, 286749480 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x264ef27d
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 286749479 286747432 136.7G 83 Linux
Disk /dev/sdb: 136.8 GiB, 146815733760 bytes, 286749480 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc06248cd
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 85448703 85446656 40.8G 83 Linux
/dev/sdb2 85450750 286748671 201297922 96G 5 Extended
/dev/sdb5 85450752 286748671 201297920 96G 82 Linux swap / Solaris
Disk /dev/sdc: 136.8 GiB, 146815733760 bytes, 286749480 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 037F919F-B203-449D-A74D-9F285A3B89BD
Device Start End Sectors Size Type
/dev/sdc1 2048 286749446 286747399 136.7G Linux filesystem
Disk /dev/sde: 136.8 GiB, 146815733760 bytes, 286749480 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 66247EC5-E595-44A0-B6B8-F4A18179D457
Device Start End Sectors Size Type
/dev/sde1 2048 286749446 286747399 136.7G Linux filesystem
Disk /dev/sdd: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: C1068A13-6375-48DE-A72B-0F9B3223B6DE
Device Start End Sectors Size Type
/dev/sdd1 2048 976773134 976771087 465.8G Linux filesystem
root@bs2020:~#
There is no connection between this and zfs.
root@bs2020:~# zpool status
pool: lxd4dev
state: ONLINE
scan: scrub repaired 0 in 0h4m with 0 errors on Sun Jan 14 00:28:08 2018
config:
NAME STATE READ WRITE CKSUM
lxd4dev ONLINE 0 0 0
sdc1 ONLINE 0 0 0
errors: No known data errors
pool: lxd4infra
state: ONLINE
scan: scrub repaired 0 in 0h0m with 0 errors on Sun Jan 14 00:24:49 2018
config:
NAME STATE READ WRITE CKSUM
lxd4infra ONLINE 0 0 0
sda1 ONLINE 0 0 0
errors: No known data errors
root@bs2020:~#
if either of these are missing you need to zpool import the disk in its new location. In the long term the disks should be set up to reference their UUIDs but this requires that the pools not be in use (IE Single user mode). This is further complicated by the fact that the pools had to be created in completely different way for lxc and lxd. Hope they fix this in 18.04
## Linkdump
### Good ones
* http://kbdone.com/zfs-snapshots-clones/
* http://manpages.ubuntu.com/manpages/xenial/man8/zfs.8.html
* https://www.howtoforge.com/tutorial/how-to-use-snapshots-clones-and-replication-in-zfs-on-linux/
*
### Fodder
* https://www.thegeekdiary.com/zfs-tutorials-creating-zfs-snapshot-and-clones/
* http://lxd.readthedocs.io/en/latest/backup/#container-backup-and-restore
* https://forums.freenas.org/index.php?threads/zfs-send-to-external-backup-drive.17850/
* https://www.freebsd.org/cgi/man.cgi?query=zfs
* https://www.datto.com/uk/blog/four-ways-to-use-zfs-snapshots
* https://forum.proxmox.com/threads/adding-ssd-for-cache-zil-l2arc.25187/
* https://www.freebsd.org/cgi/man.cgi?query=zfs
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