ZFS recovery after power failure

[Sergey Gavrilov]

System was 8.1 STABLE, when it failed. 8 Seagate Constellation SAS drives
and 3ware 9690SA-8I controller (was in performance mode without BBU). I khow
it's my mistake, I relied on UPS. And UPS (Symmetra RM) was the reason of
the power failure.

Another strange thing was happened as well. System as I said was 8.1 and
always been 8.1 with ZFS ver. 15. But when I was trying to import pool I
couldn't because of my vesion of ZFS is less than pool version. zpool
upgrade -v shown ver. 14.

I've upgraded system to 8.2-PRERELEASE. It's resolved problem with versions.

By now I've recovery practically all data on pool using dd, od and the ZFS
On-Disk Specification<http://opensolaris.org/os/community/zfs/docs/ondiskformat0822.pdf>paper.

Sorry for the buzz and my english. If any questions, I will grad to answer
if it help somebody else.

2010/12/18 James R. Van Artsdalen <james-freebsd-fs2 at jrv.org>

> On 12/18/2010 2:21 AM, Sergey Gavrilov wrote:
> > Hi all!
> > After hard power off pool's faulted.
> > When I'm trying zpool import pool2 I've got:
> > cannot import 'pool2': I/O error
>
> I do know how to recover pools.  But I do want to know how  it failed.
>
> Please post the output of "uname -a" so we know what system and version
> of FreeBSD was used.
>
> Also, what of hard disks are these and how are they attached to the system?
>
>


-- 
Best regards,
Sergey Gavrilov