ZFS Recover from Faulted Pool State
- by nickv2002
I have a six disk ZFS raidz1 pool and had a recent failure requiring a disk replacement. No problem normally, but this time my server hardware died before I could do the replacement (but after and unrelated to the drive failure as far as I can tell).
I was able to get another machine from a friend to rebuild the system, but in the process of moving my drives over I had to swap their cables around a bunch until I got the right configuration where the remaining 5 good disks were seen as online. This process seems to have generated some checksum errors for the pool/raidz.
I have the 5 remaining drives set up now and a good drive installed and ready to take the place of the drive that died. However, since my pool state is FAULTED I'm unable to do the replacement.
root@zfs:~# zpool replace tank 1298243857915644462 /dev/sdb
cannot open 'tank': pool is unavailable
Is there any way to recover from this error? I would think that having 5 of the 6 drives online would be enough to rebuild the right data, but that doesn't seem to be enough now.
Here's the status log of my pool:
root@zfs:~# zpool status tank
pool: tank
state: FAULTED
status: One or more devices could not be used because the label is missing or invalid.
There are insufficient replicas for the pool to continue functioning.
action: Destroy and re-create the pool from a backup source.
see: http://zfsonlinux.org/msg/ZFS-8000-5E
scan: none requested
config:
NAME STATE READ WRITE CKSUM
tank FAULTED 0 0 1 corrupted data
raidz1-0 ONLINE 0 0 8
sdd ONLINE 0 0 0
sdf ONLINE 0 0 0
sdh ONLINE 0 0 0
1298243857915644462 UNAVAIL 0 0 0 was /dev/sdb1
sde ONLINE 0 0 0
sdg ONLINE 0 0 0
Update (10/31): I tried to export and re-import the array a few times over the past week and wasn't successful. First I tried:
zpool import -f -R /tank -N -o readonly=on -F tank
That produced this error immediately:
cannot import 'tank': I/O error
Destroy and re-create the pool from a backup source.
I added the '-X' option to the above command to try to make it check the transaction log. I let that run for about 48 hours before giving up because it had completely locked up my machine (I was unable to log in locally or via the network).
Now I'm trying a simple zpool import tank command and that seems to run for a while with no output. I'll leave it running overnight to see if it outputs anything.
