[SOLVED] ZFS data volume lost after power failure

sgala

New Member
Jul 27, 2016
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Hello,

Here Proxmox 4.1

I have (had) a ZFS volume with some VM. The server had a power lost. After the boot the ZFS volume is not readable/mounted.


root@pve:~# 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; static)
Active: failed (Result: exit-code) since Mon 2016-08-08 19:30:34 CEST; 7min ago
Process: 849 ExecStart=/sbin/zpool import -c /etc/zfs/zpool.cache -aN (code=exited, status=1/FAILURE)
Process: 733 ExecStartPre=/sbin/modprobe zfs (code=exited, status=0/SUCCESS)
Main PID: 849 (code=exited, status=1/FAILURE)

Aug 08 19:30:34 pve zpool[849]: cannot import 'zfspool1': I/O error
Aug 08 19:30:34 pve zpool[849]: Recovery is possible, but will result in some data loss.
Aug 08 19:30:34 pve zpool[849]: Returning the pool to its state as of Sat 06 Aug 2016 05:30:31 AM CEST
Aug 08 19:30:34 pve zpool[849]: should correct the problem. Approximately 7 seconds of data
Aug 08 19:30:34 pve zpool[849]: must be discarded, irreversibly. Recovery can be attempted
Aug 08 19:30:34 pve zpool[849]: by executing 'zpool import -F zfspool1'. A scrub of the pool
Aug 08 19:30:34 pve zpool[849]: is strongly recommended after recovery.
Aug 08 19:30:34 pve systemd[1]: zfs-import-cache.service: main process exited, code=exited, status=1/FAILURE
Aug 08 19:30:34 pve systemd[1]: Failed to start Import ZFS pools by cache file.
Aug 08 19:30:34 pve systemd[1]: Unit zfs-import-cache.service entered failed state.


some try:

root@pve:~# zpool status
no pools available

root@pve:~# zpool import -d /dev/disk/by-partuuid zfspool1

cannot import 'zfspool1': I/O error
Recovery is possible, but will result in some data loss.
Returning the pool to its state as of Sat 06 Aug 2016 05:30:31 AM CEST
should correct the problem. Approximately 7 seconds of data
must be discarded, irreversibly. Recovery can be attempted
by executing 'zpool import -F zfspool1'. A scrub of the pool
is strongly recommended after recovery.
# zpool import -o readonly=on -d /dev/disk/by-id/
pool: zfspool1
id: 12445319089102965614
state: FAULTED
status: One or more devices contains corrupted data.
action: The pool cannot be imported due to damaged devices or data.
The pool may be active on another system, but can be imported using
the '-f' flag.
see: http://zfsonlinux.org/msg/ZFS-8000-5E
config:

zfspool1 FAULTED corrupted data
scsi-2b126113900d00000 FAULTED corrupted data

root@pve:~# zdb
zfspool1:
version: 5000
name: 'zfspool1'
state: 0
txg: 88280
pool_guid: 12445319089102965614
errata: 0
hostid: 2831164162
hostname: 'pve'
vdev_children: 1
vdev_tree:
type: 'root'
id: 0
guid: 12445319089102965614
create_txg: 4
children[0]:
type: 'disk'
id: 0
guid: 14552473297351399686
path: '/dev/sdb1'
whole_disk: 1
metaslab_array: 35
metaslab_shift: 34
ashift: 12
asize: 1997134102528
is_log: 0
create_txg: 4
features_for_read:
com.delphix:hole_birth
com.delphix:embedded_data

SDB is a raid volume on a Adaptec 6405E and the volume at the controller level is Ok.

What I can do to recover the situation? It's happened only to me?

Thanks for any help...

Matteo
 
Hi Matteo,

Why did you run your ZFS on top of a RAID (That is clearly not the configuration ZFS is written for)? Do you have only one vdev in your pool and that is now corrupt? That's really bad :-(

I never encountered a problem like this, yet I hopefully never will. You normally give ZFS all the power over all raw devices and let it do its magic. A disk failure is inevitable, yet then easy fixable.

I can only suggest to ask on #zfsonlinux (IRC) for help.
 
I did this command:

root@pve:/# zpool import -F -d /dev/disk/by-id/ zfspool1
cannot import 'zfspool1': a pool with that name already exists
use the form 'zpool import <pool | id> <newpool>' to give it a new name

root@pve:/# zpool list
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
zfspool1 1.81T 1.23T 592G - 35% 68% 1.00x ONLINE -

the volume now it is ONLINE up & running.
 
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