Quick Linux example on checking your current RAID configuration in the terminal.

Check kernel 'md' state

cat /proc/mdstat

Example:

This is a typical Dev Box RAID configuration with OS on RAID1, and data on RAID 5

root@admin:~$ cat /proc/mdstat

Personalities : [raid1] [raid6] [raid5] [raid4]
md1 : active raid1 sdb2[1] sda2[0]
      136448 blocks [2/2] [UU]

md2 : active raid1 sdb3[1] sda3[0]
      129596288 blocks [2/2] [UU]

md3 : active raid5 sdl1[9] sdk1[8] sdj1[7] sdi1[6] sdh1[5] sdg1[4] sdf1[3] sde1[2] sdd1[1] sdc1[0]
      1318680576 blocks level 5, 1024k chunk, algorithm 2 [10/10] [UUUUUUUUUU]

md0 : active raid1 sdb1[1] sda1[0]
      16787776 blocks [2/2] [UU]

unused devices: <none>

Brief line-by-line explanation

Personalities : [raid1] [raid6] [raid5] [raid4] md1 : active raid1 sdb2[1] sda2[0] 136448 blocks [2/2] [UU]

Personalities : [raid1] [raid6] [raid5] [raid4]#Types of RAID supported by your current kernel

md1: active raid1 sdb2[1] sda2[0]
#md1 = name of RAID array
#active = RAID is active
#raid1 = type of RAID
#sdb2 and sda2 = devices associated with this RAID array
#[1] and [0] = RAID role numbers within that array, for each device

136448 blocks [2/2] [UU]#Information about fixed size and layout

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