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Diagnosing a degraded RAID 1 array

  • dangerous message upon RAID assembly:
Starting RAID: mdadm: /dev/md0 has been started with 1 drive (out of 2).
$ cat /proc/mdstat
 Personalities : [raid1] 
 md0 : active raid1 sdc1[1]
       488382841 blocks super 1.2 [2/1] [_U]
 unused devices: <none>
* [_U] means 1 drive bad, 1 drive good
* see also: http://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array

=== Solution ===
* mark degraded drive as faulty
 $ mdadm --manage /dev/md0 --fail /dev/sdb1
  • remove the degraded drive from RAID array
$ mdadm --manage /dev/md0 --remove /dev/sdb1
* if you get something, like ''"...failed: No such device"'' or ''"... being an active member ... but re-add failed."'', maybe you got [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651880 this mdadm 3.2.3 bug] => try downgrading to mdadm 3.1.4 then, that worked for me
* get a new drive, in case it's damaged
* re-add it and wait, until the RAID has recovered
 $ mdadm --manage /dev/md0 --add /dev/sdb1
mdadm: added /dev/sdb1
$ cat /proc/mdstat 
Personalities : [raid1] 
md0 : active raid1 sdb1[2] sdc1[1]
      488382841 blocks super 1.2 [2/1] [_U]
      [>....................]  recovery =  0.1% (725312/488382841) finish=438.5min speed=18531K/sec
unused devices: <none>

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