[Wylug-help] Disc failure on a software RAID system has killed everything

[Martyn Ranyard]

Hi Gary,

  Just on my way out, but sounds like the classic two drives have actually
failed, as sysresccd isn't recognising sde2.

  Either : you've physically removed (or the bios is no longer seeing) the
dead disk (are you sure it's the dead one you've removed?) and therefore
there's a problem with one of the remaining disks as well, OR two of the
five disks are dead, in which case, it's data recovery uk time...

  Remember, if you remove disk b from a 5 disk system, disk c becomes disk
b, disk d becomes c etc.

  If you have removed the "dead" disk, try putting it back so you have abcde
(check with fdisk -l /dev/sda /dev/sdb ...) and try to assemble the array.
 if it assembles degraded, you probably have removed the wrong disk.

  If not, paste the output of fdisk -l /dev/sda /dev/sdb /dev/sdc /dev/sdd
/dev/sde and perhaps people here might have enough info to spot the problem.

--
Martyn

On 20 May 2010 11:15, Gary Stainburn <gary.stainburn at ringways.co.uk> wrote:

> On Thursday 20 May 2010 10:11:35 Gary Stainburn wrote:
> >     Number   Major   Minor   RaidDevice State
> >        0       0        0        0      removed
> >        1       0        0        1      removed
> >        2       0        0        2      removed
> >        3       8       34        3      active sync   /dev/sdc2
> >        4       8       50        4      active sync   /dev/sdd2
> > root at sysresccd /root %
>
> I'm trying to assemble the array as much as possible, but I can't because
> it
> complains about missing super blocks.  Anyone got suggestions (/dev/sdb2 is
> on the dead drive)
>
> root at sysresccd /root %
> mdadm --assemble /dev/md2 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2 /dev/sde2
> mdadm: no RAID superblock on /dev/sdb2
> mdadm: /dev/sdb2 has no superblock - assembly aborted
> root at sysresccd /root %
> mdadm --assemble /dev/md2 /dev/sda2 /dev/sdc2 /dev/sdd2 /dev/sde2
> mdadm: cannot open device /dev/sde2: No such file or directory
> mdadm: /dev/sde2 has no superblock - assembly aborted
> root at sysresccd /root % mdadm --assemble /dev/md2 /dev/sda2 /dev/sdc2
> /dev/sdd2
> mdadm: /dev/md2 assembled from 2 drives - not enough to start the array.
> root at sysresccd /root % mdadm --manage --run /dev/md2
> mdadm: failed to run array /dev/md2: Input/output error
> root at sysresccd /root % mdadm --detail /dev/md2
> /dev/md2:
>        Version : 0.90
>  Creation Time : Fri Aug 29 12:29:18 2008
>     Raid Level : raid5
>  Used Dev Size : 483492096 (461.09 GiB 495.10 GB)
>   Raid Devices : 5
>  Total Devices : 2
> Preferred Minor : 2
>    Persistence : Superblock is persistent
>
>    Update Time : Thu May 13 20:27:51 2010
>          State : active, degraded, Not Started
>  Active Devices : 2
> Working Devices : 2
>  Failed Devices : 0
>  Spare Devices : 0
>
>         Layout : left-symmetric
>     Chunk Size : 256K
>
>           UUID : 549f851d:f698831d:8e1f38fa:6d8d3a6f
>         Events : 0.553056
>
>    Number   Major   Minor   RaidDevice State
>       0       0        0        0      removed
>       1       0        0        1      removed
>       2       0        0        2      removed
>       3       8       34        3      active sync   /dev/sdc2
>       4       8       50        4      active sync   /dev/sdd2
> root at sysresccd /root % mdadm --manage --stop /dev/md2
> mdadm: stopped /dev/md2
> root at sysresccd /root % mdadm --assemble /dev/md2 /dev/sda2
> mdadm: /dev/md2 assembled from 1 drive - not enough to start the array.
> root at sysresccd /root % mdadm --manage --run /dev/md2
> mdadm: failed to run array /dev/md2: Input/output error
> root at sysresccd /root % mdadm --detail /dev/md2
> /dev/md2:
>        Version : 0.90
>  Creation Time : Fri Aug 29 12:29:18 2008
>     Raid Level : raid5
>  Used Dev Size : 483492096 (461.09 GiB 495.10 GB)
>   Raid Devices : 5
>  Total Devices : 1
> Preferred Minor : 2
>    Persistence : Superblock is persistent
>
>     Update Time : Thu May 13 20:22:11 2010
>           State : active, degraded, Not Started
>  Active Devices : 1
> Working Devices : 1
>  Failed Devices : 0
>  Spare Devices : 0
>
>         Layout : left-symmetric
>     Chunk Size : 256K
>
>           UUID : 549f851d:f698831d:8e1f38fa:6d8d3a6f
>          Events : 0.553049
>
>    Number   Major   Minor   RaidDevice State
>        0       8        2        0      active sync   /dev/sda2
>        1       0        0        1      removed
>       2       0        0        2      removed
>        3       0        0        3      removed
>       4       0        0        4      removed
> root at sysresccd /root %
>
>
> --
> Gary Stainburn
>
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