raid problem

[François Patte]

Bonsoir,

I have a problem with 2 raid arrays: I have 2 disks (sdc and sdd) in
raid1 arrays.

One disk (sdc) failed and I replaced it by a new one. Copying the
partition table from sdd disk using sfdisk:

sfdisk -d /dev/sdd | sfdisk /dev/sdc

then I "added" the 2 partitions (sdc1 and sdc3) to the arrays md0 and md1:

mdadm --add /dev/md0 /dev/sdc1

mdadm --add /dev/md1 /dev/sdc3

There were no problem with the md0 array:


cat /proc/mdstat gives:

md0 : active raid1 sdc1[1] sdd1[0]
      1052160 blocks [2/2] [UU]


But for the md1 array, I get:

md1 : active raid1 sdc3[2](S) sdd3[0]
      483138688 blocks [2/1] [U_]


And mdadm --detail /dev/md1 returns:

/dev/md1:
        Version : 0.90
  Creation Time : Sat Mar  7 11:48:30 2009
     Raid Level : raid1
     Array Size : 483138688 (460.76 GiB 494.73 GB)
  Used Dev Size : 483138688 (460.76 GiB 494.73 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Fri Nov 29 21:23:25 2013
          State : clean, degraded
 Active Devices : 1
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 1

           UUID : 2e8294de:9b0d8d96:680a5413:2aac5c13
         Events : 0.72076

    Number   Major   Minor   RaidDevice State
       0       8       51        0      active sync   /dev/sdd3
       2       0        0        2      removed

       2       8       35        -      spare   /dev/sdc3

While mdadm --examine /dev/sdc3 returns:

/dev/sdc3:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : 2e8294de:9b0d8d96:680a5413:2aac5c13
  Creation Time : Sat Mar  7 11:48:30 2009
     Raid Level : raid1
  Used Dev Size : 483138688 (460.76 GiB 494.73 GB)


     Array Size : 483138688 (460.76 GiB 494.73 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1

    Update Time : Fri Nov 29 23:03:41 2013
          State : clean
 Active Devices : 1
Working Devices : 2
 Failed Devices : 1
  Spare Devices : 1
       Checksum : be8bd27f - correct
         Events : 72078


      Number   Major   Minor   RaidDevice State
this     2       8       35        2      spare   /dev/sdc3

   0     0       8       51        0      active sync   /dev/sdd3
   1     1       0        0        1      faulty removed
   2     2       8       35        2      spare   /dev/sdc3


What is the problem? And how can I recover a correct md1 array?

Thank you.


-- 
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)1 8394 5849
http://www.math-info.univ-paris5.fr/~patte

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