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How to Use MDADM Linux Raid
A highly resilient raid solution!
By Red Squirrel

mdadm cheat/reference sheet

Create a 6 drive raid 5 array called /dev/md0 with chunk size of 16384: (typically, bigger chunk sizes are better for bigger files, default is 512)

mdadm --create --level=5 --chunk=16384--raid-devices=6 /dev/md0 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg

Assemble raid array that is not in the config file:

mdadm --assemble /dev/md0 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg

Create config file:

mdadm --detail --scan > /etc/mdadm.conf

Add new disk and grow raid array:

mdadm --add /dev/md0 /dev/sdh
mdadm --grow /dev/md0 --raid-devices=7

Mark drive as failed, and remove from array. (this can be good if you want to replace a drive even though it has not failed)

mdadm --fail /dev/md0 /dev/sdg
mdadm --remove /dev/md0 /dev/sdg

Stop array: (must ensure the file system is dismounted first)

mdadm --stop /dev/md0

Start array:

mdadm --run /dev/md0

Get details on an array:

mdadm --detail /dev/md0

Monitor all arrays: (to get emails of failures and such)

mdadm --monitor --scan --mail=[email address] --delay=1800 &

View rebuild speed limit:

sysctl dev.raid.speed_limit_max

Modify rebuild speed limit:

sysctl -w dev.raid.speed_limit_max=value

Increase performance before a rebuild operation:

mdadm --grow --bitmap=internal /dev/md0

Once rebuild is done:

mdadm --grow --bitmap=none /dev/md0

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