PBS on PVE zpool import after reboot

[ademirk]

I did setup a PBS on same host as a pve (I will not use this pve for running propouse, I have others), but I need to connect my backup disk who is a iscsi disk (previous used on another pbs) .
My iscsi disk is going up normaly after reboot, but zpool import doesn't work.
So my datastore is not available after reboot host.


# systemctl status zfs-import-cache.service
○ zfs-import-cache.service - Import ZFS pools by cache file
Loaded: loaded (/lib/systemd/system/zfs-import-cache.service; enabled; preset: enabled)
Active: inactive (dead)
Condition: start condition failed at Wed 2024-08-14 21:55:25 -03; 3min 16s ago
└─ ConditionFileNotEmpty=/etc/zfs/zpool.cache was not met
Docs: man:zpool(8)

Aug 14 21:55:25 pve4 systemd[1]: zfs-import-cache.service - Import ZFS pools by cache file was skipped because of an unmet condition check (ConditionFileNotEmp

 

[ggoller]

Hi!
this is the zfs-import-cache service which imports pools mentioned in the zpool.cache file (which in your case is empty). zfs also creates a service for each pool, i.e. zfs-import@<pool-name>.service which runs at startup and imports the pool. Check if there is a service with your pool name and enable it if it isn't (systemctl enable). If it's enabled, check its logs for any errors using systemctl status.

 

[ademirk]

Hi!
There was no service 'zfs-import@poolname.service', and no exclusive cache file, so I did create the cache file with the following:

zpool set cachefile=/etc/zfs/zpoolbackups.cache backups

and then created a service for that import.

On reboot, it fails. I think it's because the this is iscsi and zpool import is running before iscsi is ready, but I don't know I to verify this.

My service is working fine, when I start it manually.

root@pve4:~# zpool list
no pools available
root@pve4:~# systemctl status zfs-import-backups-cache
● zfs-import-backups-cache.service - Import ZFS pools by cache file
     Loaded: loaded (/etc/systemd/system/zfs-import-backups-cache.service; enabled; preset: enabled)
     Active: active (exited) since Wed 2024-08-21 13:41:18 -03; 32s ago
       Docs: man:zpool(8)
    Process: 546 ExecStart=/sbin/zpool import -c /etc/zfs/zpoolbackups.cache -aN $ZPOOL_IMPORT_OPTS>
   Main PID: 546 (code=exited, status=0/SUCCESS)
        CPU: 36ms

Aug 21 13:41:14 pve4 systemd[1]: Starting zfs-import-backups-cache.service - Import ZFS pools by ca>
Aug 21 13:41:17 pve4 zpool[546]: cannot import 'backups': no such pool or dataset
Aug 21 13:41:18 pve4 zpool[546]: no pools available to import
Aug 21 13:41:18 pve4 zpool[546]:         Destroy and re-create the pool from
Aug 21 13:41:18 pve4 zpool[546]:         a backup source.
Aug 21 13:41:18 pve4 zpool[546]: cachefile import failed, retrying
Aug 21 13:41:18 pve4 systemd[1]: Finished zfs-import-backups-cache.service - Import ZFS pools by ca>
root@pve4:~# systemctl status zfs-import-backups-cache
● zfs-import-backups-cache.service - Import ZFS pools by cache file
     Loaded: loaded (/etc/systemd/system/zfs-import-backups-cache.service; enabled; preset: enabled)
     Active: active (exited) since Wed 2024-08-21 13:41:18 -03; 54s ago
       Docs: man:zpool(8)
    Process: 546 ExecStart=/sbin/zpool import -c /etc/zfs/zpoolbackups.cache -aN $ZPOOL_IMPORT_OPTS>
   Main PID: 546 (code=exited, status=0/SUCCESS)
        CPU: 36ms

Aug 21 13:41:14 pve4 systemd[1]: Starting zfs-import-backups-cache.service - Import ZFS pools by ca>
Aug 21 13:41:17 pve4 zpool[546]: cannot import 'backups': no such pool or dataset
Aug 21 13:41:18 pve4 zpool[546]: no pools available to import
Aug 21 13:41:18 pve4 zpool[546]:         Destroy and re-create the pool from
Aug 21 13:41:18 pve4 zpool[546]:         a backup source.
Aug 21 13:41:18 pve4 zpool[546]: cachefile import failed, retrying
Aug 21 13:41:18 pve4 systemd[1]: Finished zfs-import-backups-cache.service - Import ZFS pools by ca>
root@pve4:~# systemctl restart zfs-import-backups-cache
root@pve4:~# zpool list
NAME      SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
backups  5.98T  3.79T  2.19T        -         -    21%    63%  1.00x    ONLINE  -
root@pve4:~# systemctl status zfs-import-backups-cache
● zfs-import-backups-cache.service - Import ZFS pools by cache file
     Loaded: loaded (/etc/systemd/system/zfs-import-backups-cache.service; enabled; preset: enabled)
     Active: active (exited) since Wed 2024-08-21 13:42:26 -03; 14s ago
       Docs: man:zpool(8)
    Process: 1479 ExecStart=/sbin/zpool import -c /etc/zfs/zpoolbackups.cache -aN $ZPOOL_IMPORT_OPT>
   Main PID: 1479 (code=exited, status=0/SUCCESS)
        CPU: 265ms

Aug 21 13:42:24 pve4 systemd[1]: Starting zfs-import-backups-cache.service - Import ZFS pools by ca>
Aug 21 13:42:26 pve4 systemd[1]: Finished zfs-import-backups-cache.service - Import ZFS pools by ca>

 

[ggoller]

Hmm, yes looks like it.
You could try including this line in the /etc/modprobe.d/zfs.conf file:

options scsi_mod scan=sync

this forces the zfs module to do a scsi scan before loading.