Software RAID support on Linux

Good RAID FAQ on Linux here.

Walkthrough on setting up a software RAID array here

Check RAID status:

<code>/sbin/mdadm --detail /dev/md0</code>

Or check with this:

<code>sudo cat /proc/mdstat</code>

This is what a good status will look like:

<code>
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md1 : active raid1 sdb5[0] sdc5[1]
      1485888 blocks [2/2] [UU]
      
md0 : active raid1 sdb1[0] sdc1[1]
      242709888 blocks [2/2] [UU]
      
unused devices: <none>

The [UU] (I think) indicates the status of both drives in the array, and both are Up

Removing drives: sudo mdadm /dev/md0 -r /dev/sdb1

Adding drives back to the array: sudo mdadm /dev/md0 -a /dev/sdb1

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