recover data from linear raid
Neil Brown
neilb at cse.unsw.edu.au
Mon Jun 26 06:37:35 UTC 2006
On Saturday June 24, dzila at tassadar.physics.auth.gr wrote:
>
> Hello,
>
> I had a scientific linux 3.0.4 system (rhel compatible), with 3
> ide disks, one for / and two others in linear raid (250 gb and 300 gb
> each).
> This system was obsoleted so i move the raid disks to a new
> scientific linux 3.0.7 installation. However, the raid array was not
> detected ( I put the disks on the same channels and same master/lsave
> setup as in the previous setup). In fact fdisk reports that the disks are
> not partitioned.
> I had around 70 gb data on that array I would like to recover. I
> used dd on the disks and strings on the resulting file. The data is there
> but fsck complains about superblocks and fails.
>
> Recommentations on how to proceed are greatly appreciated.
As Christian said, specific error message help a lot.
Assume the two devices are hdc and hde,
fdisk -l /dev/hdc
fdisk -l /dev/hde
mdadm -E /dev/hdc
mdadm -E /dev/hde
and my best guess
mdadm --build /dev/md0 --level linear --raid-disks 2 /dev/hdc /dev/hde
fsck -n /dev/md0
(and linux-raid at vger.kernel.org might be a better mailing list for
this particular sort of problem).
NeilBrown
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