debian:~# cat /proc/mdstat

Personalities : [raid1] 
md2 : active raid1 sdb2[0] sda2[1]
      975763866 blocks super 1.2 [2/2] [UU]
      bitmap: 5/466 pages [20KB], 1024KB chunk

md0 : active raid1 sdb1[0] sda1[1]
      995904 blocks [2/2] [UU]
      
unused devices: <none>

Problém s jedním zařízením (hdd1):

debian:~# cat /proc/mdstat
Personalities : [raid1] 
md0 : active raid1 hda1[0] hdd1[3](F) hdb1[1]
      1172608 blocks [3/2] [UU_]
      
unused devices: <none>

Rekonstrukce pole po výměně disku:

debian:~# cat /proc/mdstat
Personalities : [raid1] 
md0 : active raid1 hdd1[3] hda1[0] hdb1[1]
      1172608 blocks [3/2] [UU_]
      [=====>...............]  recovery = 28.0% (328768/1172608) finish=0.7min speed=18264K/sec
      
unused devices: <none>