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

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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 :

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 [raid1]

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[raid6]

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[raid5]

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[raid4]


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#Types of RAID supported by your current kernel

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md1:

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active

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raid1

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sdb2[1]

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sda2[0]


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#md1 = name of RAID array

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#active = RAID is

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active 

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#raid1 = type of RAID

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#sdb2 and sda2 = devices associated with this RAID array
#[1] and [0] = RAID role numbers within that array, for each

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device   

136448

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blocks

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[2/2]

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[UU]


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#Information about fixed size and layout

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