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Full Discussion: RAID5 multi disk failure
Top Forums UNIX for Advanced & Expert Users RAID5 multi disk failure Post 302592332 by chebarbudo on Monday 23rd of January 2012 02:18:59 PM
Old 01-23-2012
Error RAID5 multi disk failure
Hi there,

Don't know if my title is relevant but I'm dealing with dangerous materials that I don't really know and I'm very afraid to mess anything up.

I have a Debian 5.0.4 server with 4 x 1TB hard drives.

I have the following mdstat
Code:
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md1 : active raid1 sda1[0] sdd1[3] sdb1[1] sdc1[2]
      1024896 blocks [4/4] [UUUU]

md5 : active raid1 sda5[0] sdd5[3] sdb5[1] sdc5[2]
      1023872 blocks [4/4] [UUUU]

md6 : active raid1 sda6[0] sdd6[3] sdb6[1]
      1023872 blocks [4/3] [UU_U]

md7 : active raid1 sda7[0] sdd7[3] sdb7[1] sdc7[2]
      1023872 blocks [4/4] [UUUU]

md8 : active raid1 sdd8[3] sdb8[1] sdc8[2]
      1023872 blocks [4/3] [_UUU]

unused devices: <none>

That's kind of weird because I use to have a huge md10 partition with a monstruous amount of important files.

I have no idea where to start!

I tried to examine the partitions in the multi-disk :
Code:
root@titan:~# mdadm --examine /dev/sda10
/dev/sda10:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
  Creation Time : Sat Apr 17 16:30:50 2010
     Raid Level : raid5
  Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
     Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 10

    Update Time : Sun Jun  5 16:00:41 2011
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0
       Checksum : ac3fac12 - correct
         Events : 2552115

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     0       8       10        0      active sync   /dev/sda10

   0     0       8       10        0      active sync   /dev/sda10
   1     1       8       26        1      active sync   /dev/sdb10
   2     2       8       42        2      active sync   /dev/sdc10
   3     3       8       58        3      active sync   /dev/sdd10
root@titan:~# mdadm --examine /dev/sdb10
/dev/sdb10:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
  Creation Time : Sat Apr 17 16:30:50 2010
     Raid Level : raid5
  Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
     Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 10

    Update Time : Mon Jan 23 12:05:02 2012
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 1
  Spare Devices : 0
       Checksum : ade16f37 - correct
         Events : 6224199

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     1       8       26        1      active sync   /dev/sdb10

   0     0       0        0        0      removed
   1     1       8       26        1      active sync   /dev/sdb10
   2     2       0        0        2      faulty removed
   3     3       8       58        3      active sync   /dev/sdd10
root@titan:~# mdadm --examine /dev/sdc10
/dev/sdc10:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
  Creation Time : Sat Apr 17 16:30:50 2010
     Raid Level : raid5
  Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
     Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 10

    Update Time : Fri Jan 20 23:16:43 2012
          State : active
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0
       Checksum : ad7f1c03 - correct
         Events : 6223465

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     2       8       42        2      active sync   /dev/sdc10

   0     0       0        0        0      removed
   1     1       8       26        1      active sync   /dev/sdb10
   2     2       8       42        2      active sync   /dev/sdc10
   3     3       8       58        3      active sync   /dev/sdd10
root@titan:~# mdadm --examine /dev/sdd10
/dev/sdd10:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
  Creation Time : Sat Apr 17 16:30:50 2010
     Raid Level : raid5
  Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
     Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 10

    Update Time : Mon Jan 23 12:05:02 2012
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 1
  Spare Devices : 0
       Checksum : ade16f5b - correct
         Events : 6224199

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     3       8       58        3      active sync   /dev/sdd10

   0     0       0        0        0      removed
   1     1       8       26        1      active sync   /dev/sdb10
   2     2       0        0        2      faulty removed
   3     3       8       58        3      active sync   /dev/sdd10

But that doesn't really help...
I have no idea how to interpret the results!
I'm scared with the "faulty" and "removed" warnings.
Can anyone give me a hint?
Is there any other command I can run to regain access to the data, at least read-only?

Thanks for your help.
Santiago
 

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