raid not booting

[Reinhard Haller]

Rashkae schrieb:
> Reinhard Haller wrote:
>   
>> Hi,
>>
>> this morning my ubuntu box wasn't accessible (no local access, no ssh, 
>> no http -- ping worked), so I resetted the server.
>>
>> The box didn't boot with the following messages:
>>
>> There appears to be one or more degraded RAID devices ...
>>
>> md0: incative sdc2[2](S) sdb2[1](S) sdc3[3](S)
>>
>> The suggested start with the degraded raid (mdadm -R /dev/md0) gives the 
>> following messages:
>>
>> mdadm: CREATE user root not found
>> mdadm: CREATE group disk not found
>> raid5: not enough operational devices for md0 (2/3 failed)
>>
>> I tested all drives with the Samsung HD-Utility: they are all 3 fully 
>> operational, the partitions are all present!
>>
>> Operating system: ubuntu 8.04 kernel: 2.6.24-18-server
>>
>> Any suggestions how to get it working again?
>>
>> Thanks
>> Reinhard
>>
>>
>>     
>
>
> Suggestions only, not tested in this kind of scenario, and may cause
> permanent data loss.
>
> Since all partitions are present and accounted for, you try to just
> force  the array to assemble
>
> mdadm -A -f /dev/md0
>   
Assembling ends in a bunch of error messages:

ata4.00: cmd 25/00:00:88:03:97/00: 03:00:00:00/e0 tag 0 dma 393216 in
ata4.00: status { DRDY }
ata4.00: revalidation failed (errno=-5)
ata4.00: revalidation failed (errno=-5)
ata4.00: revalidation failed (errno=-5)
sd 3:0:0:0: [sdb] Asking for cache data failed
sd 3:0:0:0: [sdb] Assuming drive cache write through
raind5: Disk failure on sdb2, disabling device

The same is repeated for ata3 and the next drive is disabled --> end of 
start

> On a side (snide?) note, please tell me that is a typo in your message
> and you didn't really create a Raid 5 array with 2 partitions on the
> same drive! (sdc)
>
>   
yeah it is. 3 disks, 2 with swap and raid, 1 with boot, swap and raid 
partitions.


Reconstructing the array with a recovery installation resulted in a 
bunch of error messages. Testing the drives with
the DOS based HD-Utility gave no errors (even the complete surface 
scan). Is there a way to copy the disk data
offline and assemle it?

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