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Old 10-29-2009, 08:56 AM   #1
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Registered: May 2004
Location: Orlando, FL
Distribution: Arch
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Missing Drive From RAID1 Mirror

I noticed today on my Arch Linux system that /dev/sda3 is missing from the mirror. I don't understand why or how to resolve this. Can someone please assist me in repairing the broken mirror?

[root@mail ~]# cat /proc/mdstat
Personalities : [raid1] 
md2 : active raid1 sdb3[1]
      728571776 blocks [2/1] [_U]
md1 : active raid1 sda2[0] sdb2[1]
      2000000 blocks [2/2] [UU]
md0 : active raid1 sda1[0] sdb1[1]
      1999936 blocks [2/2] [UU]
Then I checked to see if the following had any info...

[root@mail ~]# mdadm --misc --detail /dev/md2
        Version : 0.90
  Creation Time : Thu Oct 29 04:48:38 2009
     Raid Level : raid1
     Array Size : 728571776 (694.82 GiB 746.06 GB)
  Used Dev Size : 728571776 (694.82 GiB 746.06 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 2
    Persistence : Superblock is persistent

    Update Time : Thu Oct 29 09:52:12 2009
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           UUID : f46bd6c9:01829ddb:1da0a365:a6c675d9
         Events : 0.13

    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       8       19        1      active sync   /dev/sdb3
Old 10-30-2009, 06:47 PM   #2
Forrest Coredump
Registered: Oct 2009
Location: Southwestern United States
Distribution: Redhat Enterprise Linux 4-5 (Current RHCE), Fedora Core 11 (FC11), Arch Linux, BT3 (Current GCIH)
Posts: 42

Rep: Reputation: 16
One of your drive members was removed. Simply use the mdadm command to re-add it

[root@stem]$ mdadm -a /dev/sd3 /dev/md2

and you'll be kosher.

Last edited by Forrest Coredump; 10-30-2009 at 06:52 PM.


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