Re: data recovery on raid5

[Christian Pedaschus <cpedaschus@gmx.de>]

nice to hear you got your data back.
now it's perhaps a good time to donate some money to some
ppls/oss-projects for saving your ass ;) ;)

greets, chris



Jonathan wrote:

> hazel /virtual # mdadm -C /dev/md0 -c 32 -n 4 -l 5
> --parity=left-asymmetric missing /dev/etherd/e0.[023]
> mdadm: /dev/etherd/e0.0 appears to be part of a raid array:
>    level=5 devices=4 ctime=Sat Apr 22 13:25:40 2006
> mdadm: /dev/etherd/e0.2 appears to be part of a raid array:
>    level=5 devices=4 ctime=Sat Apr 22 13:25:40 2006
> mdadm: /dev/etherd/e0.3 appears to contain an ext2fs file system
>    size=720300416K  mtime=Wed Oct  5 16:39:28 2005
> mdadm: /dev/etherd/e0.3 appears to be part of a raid array:
>    level=5 devices=4 ctime=Sat Apr 22 13:25:40 2006
> Continue creating array? y
> mdadm: array /dev/md0 started.
> hazel /virtual # mount -t ext2 -r /dev/md0 /md0
> hazel /virtual # df -H
> Filesystem             Size   Used  Avail Use% Mounted on
> /dev/hda4               67G   5.8G    58G  10% /
> udev                   526M   177k   526M   1% /dev
> /dev/hda3              8.1G    34M   7.7G   1% /tmp
> none                   526M      0   526M   0% /dev/shm
> /dev/md1               591G    11G   551G   2% /virtual
> /dev/md0               591G    54G   507G  10% /md0
>
> now I'm doing a:
>
> (cd /md0 && tar cf - . ) | (cd /virtual/recover/ && tar xvfp -)
>
> thank you thank you thank you thank you thank you thank you
>
>
> Molle Bestefich wrote:
>
>> Jonathan wrote:
>>  
>>
>>> Well, the block sizes are back to 32k now, but I still had no luck
>>> mounting /dev/md0 once I created the array.
>>>   
>>
>>
>> Ahem, I missed something.
>> Sorry, the 'a' was hard to spot.
>>
>> Your array used layout : left-asymmetric, while the superblock you've
>> just created has layout: left-symmetric.
>>
>> Try again, but add the option "--parity=left-asymmetric"
>>
>
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