tldr/pages/linux/mdadm.md

mdadm

RAID management utility. More information: https://linux.die.net/man/8/mdadm.

• Create array:

mdadm --create {{/dev/md/MyRAID}} --level {{raid_level}} --raid-devices {{number_of_disks}} {{/dev/sdXN}}

• Stop array:

mdadm --stop {{/dev/md0}}

• Mark disk as failed:

mdadm --fail {{/dev/md0}} {{/dev/sdXN}}

• Remove disk:

mdadm --remove {{/dev/md0}} {{/dev/sdXN}}

• Add disk to array:

mdadm --assemble {{/dev/md0}} {{/dev/sdXN}}

• Show RAID info:

mdadm --detail {{/dev/md0}}