Something

root@server:/etc# mdadm -E /dev/sdd
/dev/sdd:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : e1ce7a2a:b16261d8:973c03f8:253844ac
  Creation Time : Tue Mar 27 22:21:59 2007
     Raid Level : raid5
    Device Size : 16281728 (15.53 GiB 16.67 GB)
     Array Size : 32563456 (31.05 GiB 33.34 GB)
   Raid Devices : 3
  Total Devices : 4
Preferred Minor : 0

    Update Time : Wed Mar 28 00:27:10 2007
          State : clean
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 85dc98dd - correct
         Events : 0.12

         Layout : left-symmetric
     Chunk Size : 32K

      Number   Major   Minor   RaidDevice State
this     0       8       48        0      active sync   /dev/sdd

   0     0       8       48        0      active sync   /dev/sdd
   1     1       8       21        1      active sync   /dev/.static/dev/sdb5
   2     2       8       37        2      active sync   /dev/.static/dev/sdc5