mdadm

raatikainen:/home/tuipveus/raid# mdadm -E /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : eac5488b:2acf229f:5ecf658c:c057d10c
  Creation Time : Tue Jun 26 02:58:02 2012
     Raid Level : raid1
  Used Dev Size : 192640 (188.16 MiB 197.26 MB)
     Array Size : 192640 (188.16 MiB 197.26 MB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 4

    Update Time : Wed Jun 27 18:45:14 2012
          State : clean
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 7dbe0ae9 - correct
         Events : 411


      Number   Major   Minor   RaidDevice State
this     0       8        1        0      active sync   /dev/sda1

   0     0       8        1        0      active sync   /dev/sda1
   1     1       8       17        1      active sync   /dev/sdb1
   2     2       8       33        2      active sync   /dev/sdc1