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# mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Thu Jan 17 12:34:38 2013
     Raid Level : raid1
     Array Size : 231028 (225.65 MiB 236.57 MB)
  Used Dev Size : 231028 (225.65 MiB 236.57 MB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Sun Sep  3 00:57:09 2017
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : server:0  (local to host server)
           UUID : 00e59375:d4843baa:a68122b4:9df7ad3a
         Events : 2196

    Number   Major   Minor   RaidDevice State
       2       8        1        0      active sync   /dev/sda1
       3       8       17        1      active sync   /dev/sdb1
server:~# mdadm -D /dev/md1
/dev/md1:
        Version : 0.90
  Creation Time : Fri Jan 16 17:47:54 2009
     Raid Level : raid1
     Array Size : 1464894976 (1397.03 GiB 1500.05 GB)
  Used Dev Size : 1464894976 (1397.03 GiB 1500.05 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Tue Sep 12 11:09:48 2017
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 99be939b:58238c48:fa8b64fc:811dc3c8
         Events : 0.4260854

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       8       18        1      active sync   /dev/sdb2

# fdisk -l | grep /dev/md0
Disk /dev/md0: 225,6 MiB, 236572672 bytes, 462056 sectors
# fdisk -l | grep /dev/md1
Disk /dev/md1: 1,4 TiB, 1500052455424 bytes, 2929789952 sectors

# fdisk -l | grep /dev/sda
Disk /dev/sda: 1,8 TiB, 2000398934016 bytes, 3907029168 sectors
/dev/sda1  *       2048    2099199    2097152    1G fd Linux raid autodetect
/dev/sda2       2099200 3906633189 3904533990  1,8T fd Linux raid autodetect