Date: Sun, 2 Jun 2013 15:02:58 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Alban Hertroys" <haramrae@gmail.com>, <freebsd-stable@freebsd.org> Subject: Re: Corrupt GPT header on disk from twa array - fixable? Message-ID: <7ABBEE71A96E411793E41BD97DA72BCE@multiplay.co.uk> References: <EA2DCEC2-8B07-434B-8B60-8AB15B3788F7@gmail.com>
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Does "gpart recover ada4" help at all?
Be warned this could edit the partition on the disk and make it worse, but I've had success in the past with it.
Regards
Steve
----- Original Message -----
From: "Alban Hertroys" <haramrae@gmail.com>
To: <freebsd-stable@freebsd.org>
Sent: Sunday, June 02, 2013 2:53 PM
Subject: Corrupt GPT header on disk from twa array - fixable?
> Hello list,
>
> I just replaced my home server and moved the disks from the old one over to the new one. In the old server, 4 of the disks were
> connected to a twa (3Ware 9550) controller, which of course has it's own way of marking units/volumes on those disks.
>
> Before you start yelling at me, yes, of course I made backups ;) [*]
>
> The thing is, I have these disks in the new server and I found that I (to my surprise) I can actually mount them! But, I'm
> missing a large part and I am wondering if there's some method to access those last partitions too.
>
> Here's what gpart show says about the problematic disk:
>
> # gpart show /dev/ada4
> => 34 41942972 ada4 GPT (931G) [CORRUPT]
> 34 128 1 freebsd-boot (64k)
> 162 1048448 2 freebsd-ufs (512M)
> 1048610 6291456 3 freebsd-swap (3.0G)
> 7340066 1048576 4 freebsd-ufs (512M)
> 8388642 2097152 5 freebsd-ufs (1.0G)
> 10485794 31457211 6 freebsd-ufs (15G)
> 41943005 1 - free - (512B)
>
> As you can see, most (about 910GB) of the disk is missing! This disk was one half of a mirror on the twa controller, which had
> those disks split in two again (I don't recall how, perhaps 2 different BSD slices?)
> I already looked if that part may perhaps have ended up as a different device. On the old server, fstab was this:
>
> # cat /tmp/solfertje/etc/fstab
> # Device Mountpoint FStype Options Dump Pass#
>
> # These are the partitions listed above in gpart
> /dev/da0p2 / ufs rw 1 1
> /dev/da0p3 none swap sw 0 0
> /dev/da0p4 /var ufs rw 2 2
> /dev/da0p5 /tmp ufs rw 2 2
> /dev/da0p6 /usr ufs rw 2 2
>
> # These are missing
> /dev/da1p1 /home ufs rw 2 2
> /dev/da1p2 /media ufs rw 2 2
>
> # These are on a different disk (ada2)
> /dev/da2p1 /media2 ufs rw 2 2
>
>
> I don't _really_ need to get to those partitions, but it would be a comfortable thought if it were possible somehow.
>
>
> [*] The reason I was trying to access those disks anyway is that I thought I forgot to backup my database tables, but it turns
> out I had just misplaced that backup and it has been restored now.
>
> Alban Hertroys
> --
> If you can't see the forest for the trees,
> cut the trees and you'll find there is no forest.
>
> _______________________________________________
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>
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