On Wednesday January 25, mdadm@xxxxxxxxxxxx wrote:
> Hi,
>
> I am using a 8 disc scsi raid5 array on a fedora 3 system.
>
> after a system crash, while the array was rebuilding a missing hd,
> i am now unable to get this array running again.
>
> thats all i get (/dev/sdr1 is not the one which was rebuild):
> # mdadm -R /dev/md4
> mdadm: failed to run array /dev/md4: Invalid argument
>
> # mdadm -A /dev/md4 -
> v /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr
> 1
> looking for devices for /dev/md4
> /dev/sdk1 is identified as a member of /dev/md4, slot 0.
> /dev/sdl1 is identified as a member of /dev/md4, slot 1.
> /dev/sdm1 is identified as a member of /dev/md4, slot 2.
> /dev/sdn1 is identified as a member of /dev/md4, slot 8.
> /dev/sdo1 is identified as a member of /dev/md4, slot 4.
> /dev/sdp1 is identified as a member of /dev/md4, slot 5.
> /dev/sdq1 is identified as a member of /dev/md4, slot 6.
> mdadm: superblock on /dev/sdr1 doesn't match others - assembly aborted
>
>
> # mdadm --examine /dev/sdk1
> /dev/sdk1:
> Magic : a92b4efc
> Version : 00.90.01
> UUID : 232635af:1afe6aa5:e06f8828:99966325
snip
>
>
>
> # mdadm --examine /dev/sdr1
> /dev/sdr1:
> Magic : a92b4efc
> Version : 00.90.01
> UUID : 232605af:1afe6aa5:e06f8828:99966325
Putting those UUIDs right next to each other:
> UUID : 232635af:1afe6aa5:e06f8828:99966325
> UUID : 232605af:1afe6aa5:e06f8828:99966325
^
|
We have 2 bits of difference. This suggests a bad drive, bad RAM, bad
cabling or.... something.
You could be able to recreate the array:
mdadm -C /dev/md4 -l5 -n8 -c4 -pls /dev/sdk1 /dev/sdl1 /dev/sdm1 \
missing /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr1
(double check all of that before you actually run it, I think I have
the order right...)
but be warned that you have some dodgey hardware somewhere, and data
corruption is a real possibility.... What caused the system crash?
NeilBrown
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