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

[Gary Stainburn]

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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