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jebbench

Member

Registered: 2010-09-03

Posts: 2

[SOLVED] Mdadm - clean, degraded array won't rebuild

Hi,

I have a mdadm raid5 array, the array has 4 discs plus one spare, recently one of the discs failed and the spare was activated, I replaced the failed disc with a new one, partitioned it and added it to the array, the array was in the proccess of rebuilding when I added the new disc, while it appears to have rebuild and is operating normally mdadm --details /dev/md0 produces the following:

/dev/md0:
        Version : 1.2
  Creation Time : Thu Sep  2 19:50:17 2010
     Raid Level : raid5
     Array Size : 4389113856 (4185.79 GiB 4494.45 GB)
  Used Dev Size : 1463037952 (1395.26 GiB 1498.15 GB)
   Raid Devices : 4
  Total Devices : 5
    Persistence : Superblock is persistent

    Update Time : Mon Jan 10 19:24:02 2011
          State : clean, degraded
 Active Devices : 3
Working Devices : 5
 Failed Devices : 0
  Spare Devices : 2

         Layout : left-symmetric
     Chunk Size : 512K

           Name : archiso:0
           UUID : 628e1d3c:8556bdcd:fb7bf280:4951f749
         Events : 188605

    Number   Major   Minor   RaidDevice State
       0       8       35        0      active sync   /dev/sdc3
       5       8       67        1      spare rebuilding   /dev/sde3
       2       8        3        2      active sync   /dev/sda3
       4       8       19        3      active sync   /dev/sdb3

       1       8       51        -      spare   /dev/sdd3

cat /proc/mdstat produces:

Personalities : [raid1] [raid6] [raid5] [raid4]
md0 : active raid5 sdc3[0] sdd3[1](S) sdb3[4] sda3[2] sde3[5]
      4389113856 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [U_UU]

md2 : active raid1 sdc2[0] sdd2[1](S) sdb2[3] sda2[2] sde2[4]
      1999056 blocks super 1.2 [4/4] [UUUU]

md1 : active raid1 sdc1[0] sdd1[4](S) sdb1[3] sda1[2] sde1[1]
      96256 blocks [4/4] [UUUU]

unused devices: <none>

dmesg is full of:

RAID conf printout:
 --- level:5 rd:4 wd:3
 disk 0, o:1, dev:sdc3
 disk 1, o:1, dev:sde3
 disk 2, o:1, dev:sda3
 disk 3, o:1, dev:sdb3
RAID conf printout:
 --- level:5 rd:4 wd:3
 disk 0, o:1, dev:sdc3
 disk 1, o:1, dev:sde3
 disk 2, o:1, dev:sda3
 disk 3, o:1, dev:sdb3
RAID conf printout:
 --- level:5 rd:4 wd:3
 disk 0, o:1, dev:sdc3
 disk 1, o:1, dev:sde3
 disk 2, o:1, dev:sda3
 disk 3, o:1, dev:sdb3

Both md1 and 2 are fine.

I've rebooted the server and nothing has changed, the disc failed and was replaced about 5 days ago.

Does anyone know how I can correct md0?

Cheers,

James Bench

Last edited by jebbench (2011-01-12 18:01:59)