zfs discuss - Jul 2009 - zpool import problem / missing label / corrupted data

After a power outage due to a thunder storm my 3 disk raidz1 pool has become
UNAVAILable.
It is a ZFV v13 pool using the whole 3 disks created on FreeBSD current 8 x64
and worked well for over a month. Unfortunately I wasn''t able to import
the pool with neither a FreeBSD LiveCD or the current OpenSolaris LiveCD
x86/x64.
When I tried to import the pool with FreeBSD the system just hangs (I waited for
2 days for a response, which didn''t come, not even an error message).
Browsing the web informed me that this problem might be solved by using a newer
ZFS revision. Therefore I gave opensolaris a try, resulting in the following
zpool import -f output:

  pool: tank
      id: 582994605255991135
 state: UNAVAIL
status: The pool is formatted using an older on-disk version.
action: The pool cannot be imported due to damaged devices or data.
config:

tank               UNAVAIL    insufficient replicas
   raidz1          UNAVAIL    corrupted data
      c8t0d0p0   ONLINE
      c10d0p0    ONLINE
      c11d0p0    ONLINE

The OpenSolaris LiveCD (snv_111b) uses ZFS v14, which would explain the status
message.

zdb -l shows full LABELs on c8t0d0p0, but the other disks are missing LABEL 2
and LABEL 3.
c8t0d0p0 is connected via usb and the other disks via onboard SATA.

Some people with similar problems where able to solve them by exporting and
importing their pools.
I can''t export the pool, since I need to import it first in order to
have a pool available to export, can''t destroy it import it with the -D
option for the same reason.

At least the disks themselves seem to be okay, since dd finished on all disks
without errors.

Everything I found on the web so far was either not applicable or
didn''t lead to any results.
I hope that you can help me to get at least a fraction of the data back. The
''important data'' was the cifs share used by all in-house
computers for central storage. There are partial backups of the data, on
different disks, but those aren''t up to date with the files on the
pool. Snapshots have been made, but those are on the pool as well.

I planned on adding another disk for the OS and use the raidz for storage only.
The new disk arrived a few days after that incident with the power outage. So
I am close to just setup the whole system from scratch with the new setup, but I
want to give it a last try to recover it with your expertise. After all it would
be pretty convenient to add the raidz pool to the fresh install without loosing
any user data.

Regards, sid
-- 
This message posted from opensolaris.org

hello,

I cannot help for your problem but one of my drives wwas also destroyed by last
week-end''s storm. and what a storm it was!

good luck with your restore.
-- 
This message posted from opensolaris.org