Safe way to repair corrupted GPT partition table?

[illoai at gmail.com]

On 18 January 2013 15:08, Bob Willcox <bob at immure.com> wrote:
> Is there a way to repair a GPT partition table that has gotten corrupted
> (following a system hang during heavy I/O to a ZFS filesystem)?
>
> I now get these errors whenever I boot the system:
>
> GEOM: da0: corrupt or invalid GPT detected.
> GEOM: da0: GPT rejected -- may not be recoverable.
>
> Fortunately, my ZFS filesystem on the disk (actually a RAID 5 array on a
> ARC-1223 adapter) still mounts and seems to be ok. There is only one partition
> on the disk (the ZFS one) and it covered the entire disk so restoring it
> should be easy. Question is, is there a way to do this and will it be safe (I
> wouldn't want to trash the filesystem in the partion).
>
> A 'gpart show da0' gives this result:
>
> gpart: No such geom: da0.
>
> This is on a 9.1-STABLE system:
>
> FreeBSD rancor.immure.com 9.1-STABLE FreeBSD 9.1-STABLE #2 r245176: Tue Jan  8 15:45:29 CST 2013     bob at amidala.immure.com:/usr/obj/usr/src/sys/AMIDALA  amd64
>
>
> Any help would be much appreciated.
>

Is the whole disk in the zfs pool, or is this a
single partition covering the whole disk that
has been placed in the zfs pool?

Have you tried to repair it with the zfs tools?

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