GEOM_MIRROR GPT table corrupt or invalid

[peter harrison]

On 27 September 2011 22:58, Johan Hendriks <joh.hendriks at gmail.com> wrote:

> peter harrison schreef:
>
>  Hello list,
>>
>> I have a problem with a software RAID1. This was created under Freenas
>> 0.7.2
>> (using the web interface - FreeBSD 7.3 under the hood) which as I
>> understand
>> it uses GPT and GEOM_MIRROR. This Freenas is running on AMD64 on an ESXi
>> 4.1
>> host with the 2 drives for the mirror passed through as raw disks to the
>> Freenas guest - if that makes a difference.
>>
>> This mirror now fails to mount on boot. Checking the boot messages I see
>> this straight after the drives are detected:
>>
>> GEOM: da1: the secondary GPT table is corrupt or invalid.
>> GEOM: da1: using the primary only -- recovery suggested
>>
>> Further on I see:
>>
>> GEOM_MIRROR: Force device data start due to timeout
>> GEOM_MIRROR: Device mirror/data launched (1/2)
>>
>> The mirror is not mounted when booting is completed - no further messages
>> during boot - mount says:
>>
>> freenas:~# mount
>> /dev/da0s1a on / (ufs, local, soft-updates)
>> devfs on /dev (devfs, local)
>> procfs on /proc (procfs, local)
>>
>> When I try to mount it manually I get a continually scrolling g_vfs error:
>>
>> g_vfs_done():mirror/datap1[**READ(offset=-**636932692096956416, length
>> =16384)]
>> error = 5
>>
>> and the guest becomes unresponsive.
>>
>> GEOM isn't something I'm really familiar with - so any insight on how this
>> happened would be interesting. But the main question is, is there anyway
>> of
>> getting the data off this disk? (I have some backups, but they're not
>> complete).
>>
>> Thanks for any help.
>>
>>
>>
>> Peter Harrison.
>>
>>  You can not use gmirror and GPT at the same time on the whole disk.
>
> Both use the same diskspace to write there meta data.
> What you can do is to mirror the partitions seperately.
> A nice howto you can find here
> http://www.unix-heaven.org/**node/20 <http://www.unix-heaven.org/node/20>
>


Thanks Johan, I'll check the link out. This mirror has been running OK for
the last 6 months - so perhaps I misunderstood how FreeNAS set it up in the
first place?


>
> You can recover the GPT, but then the mirror can not load.
> if you recreate the mirror after that, the gpt label gets corrupt.
>

No hope of being able to recover any data then?

Thanks again,



Peter Harrison.

>
>
> regards,
> Johan
>
>