swraid Command

The swraid command displays the status of software RAID devices.

Type the following command from your command line. 
swraid

Examples

For software-raided model: 
> swraid
Personalities : [raid1]
md2 : active raid1 sdb2[1] sda2[0]
      2097088 blocks [2/2] [UU]
md3 : active raid1 sdb3[1] sda3[0]
      972568192 blocks [2/2] [UU]
md1 : active raid1 sdb1[1] sda1[0]
      2096064 blocks [2/2] [UU]
unused devices: <none>
For non-software-raided model: 
> swraid
swraid : No RAIDs defined