danio@NAS:~$ date
Mon Jun 14 18:24:16 CEST 2010
danio@NAS:~$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : active raid5 sde1[3] sdb1[1] sdd1[2] sdc1[0]
      4395094464 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

unused devices: <none>
danio@NAS:~$ sudo mdadm -D /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Thu Apr  2 02:19:54 2009
     Raid Level : raid5
     Array Size : 4395094464 (4191.49 GiB 4500.58 GB)
  Used Dev Size : 1465031488 (1397.16 GiB 1500.19 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Mon Jun 14 18:10:00 2010
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 64K

           UUID : 27dd8f82:5a525152:c7780c0e:bc15422d
         Events : 0.13629

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       17        1      active sync   /dev/sdb1
       2       8       49        2      active sync   /dev/sdd1
       3       8       65        3      active sync   /dev/sde1