bench pgdata # mdadm --detail --scan
ARRAY /dev/md0 metadata=1.2 name=bench:0 UUID=8d407fb2:6d54e2cb:d5bf4532:7f8e3913
bench pgdata # mdadm --examine /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8d407fb2:6d54e2cb:d5bf4532:7f8e3913
           Name : bench:0  (local to host bench)
  Creation Time : Sat Oct 17 16:18:50 2015
     Raid Level : raid0
   Raid Devices : 2

 Avail Dev Size : 195238448 (93.10 GiB 99.96 GB)
    Data Offset : 131072 sectors
   Super Offset : 8 sectors
   Unused Space : before=130984 sectors, after=0 sectors
          State : clean
    Device UUID : d5253a3d:ba09fb80:30bc07a6:dd88ced6

    Update Time : Sat Oct 17 16:18:50 2015
  Bad Block Log : 512 entries available at offset 72 sectors
       Checksum : c3a9174c - correct
         Events : 0

     Chunk Size : 512K

   Device Role : Active device 0
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
bench pgdata # mdadm --examine /dev/sdb1
/dev/sdb1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8d407fb2:6d54e2cb:d5bf4532:7f8e3913
           Name : bench:0  (local to host bench)
  Creation Time : Sat Oct 17 16:18:50 2015
     Raid Level : raid0
   Raid Devices : 2

 Avail Dev Size : 195238448 (93.10 GiB 99.96 GB)
    Data Offset : 131072 sectors
   Super Offset : 8 sectors
   Unused Space : before=130984 sectors, after=0 sectors
          State : clean
    Device UUID : e5093e0d:88998e11:9bffea40:c05e005c

    Update Time : Sat Oct 17 16:18:50 2015
  Bad Block Log : 512 entries available at offset 72 sectors
       Checksum : 4455a478 - correct
         Events : 0

     Chunk Size : 512K

   Device Role : Active device 1
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)