cat /proc/mdstat
(01:16:07) [root@ns ~]# cat /proc/mdstat 
Personalities : [raid1] 
md2 : active raid1 hda1[0] hdb1[1] 
      104320 blocks [2/2] [UU] 
 
md1 : active raid1 hdb2[1] 
      2096384 blocks [2/1] [_U] 
 
md0 : active raid1 hda3[0] hdb3[1] 
      115041344 blocks [2/2] [UU] 
 
unused devices: <none> 
[root@ns ~]# 

 /dev/hda2              14         271     2072385   fd  Linux raid autodetect

 /dev/hdb2              14         274     2096482+  fd  Linux raid autodetect

fdisk -l

Disk /dev/hda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1               1          13      104391   fd  Linux raid autodetect
/dev/hda2              14         271     2072385   fd  Linux raid autodetect
/dev/hda3             272       14593   115041465   fd  Linux raid autodetect

Disk /dev/hdb: 120.0 GB, 120060444672 bytes
255 heads, 63 sectors/track, 14596 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdb1   *           1          13      104391   fd  Linux raid autodetect
/dev/hdb2              14         274     2096482+  fd  Linux raid autodetect
/dev/hdb3             275       14596   115041465   fd  Linux raid autodetect

Disk /dev/md0: 117.8 GB, 117802336256 bytes
2 heads, 4 sectors/track, 28760336 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md0 doesn't contain a valid partition table

Disk /dev/md1: 2146 MB, 2146697216 bytes
2 heads, 4 sectors/track, 524096 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md1 doesn't contain a valid partition table

Disk /dev/md2: 106 MB, 106823680 bytes
2 heads, 4 sectors/track, 26080 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

    Device Boot      Start         End      Blocks   Id  System