root@ubuntu:/var/www/.backups/mysql# mdadm --detail /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Mon Oct  1 12:04:16 2012
     Raid Level : raid1
     Array Size : 968254272 (923.40 GiB 991.49 GB)
  Used Dev Size : 968254272 (923.40 GiB 991.49 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Tue Mar  1 19:05:36 2016
          State : active, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : ubuntu:0  (local to host ubuntu)
           UUID : 06b21e1a:23b5bc16:e66540cd:750e9720
         Events : 5556

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       0        0        1      removed