nas brot # mdadm -D /dev/md4
/dev/md4:
        Version : 1.2
  Creation Time : Mon Dec  9 22:06:12 2013
     Raid Level : raid5
     Array Size : 5753362432 (5486.83 GiB 5891.44 GB)
  Used Dev Size : 2876681216 (2743.42 GiB 2945.72 GB)
   Raid Devices : 3
  Total Devices : 2
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sat Dec 27 10:31:33 2014
          State : clean, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 512K

           Name : nas:4  (local to host nas)
           UUID : f6924d42:7358df85:416f97f9:83aeac62
         Events : 18754

    Number   Major   Minor   RaidDevice State
       3       8       52        0      active sync   /dev/sdd4
       2       0        0        2      removed
       2       8       68        2      active sync   /dev/sde4

nas brot # mdadm -S /dev/md4
mdadm: stopped /dev/md4
nas brot # mdadm -S /dev/md2
mdadm: stopped /dev/md2