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Some commands that come in handy for software RAID arrays.

To find out what your RAID array is doing issue:

cat /proc/mdstat

To find out the status of a particular device:

mdadm –detail /dev/mdx

To remove a drive from the array:

mdadm -r /dev/md0 /dev/sdc1

(this will remove partition sdc1 from the md0 array)

To add a drive back in to an array:

mdadm /dev/md0 -a /dev/sdc1

(this will add partition sdc1 in to the md0 array)

To watch an array as it rebuilds itself:

watch -n1 cat /proc/mdstat

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