tldr/pages/linux/mdadm.md

mdadm

RAID management utility. More information: https://manned.org/mdadm.

• Create array:

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

• Stop array:

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

• Mark disk as failed:

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

• Remove disk:

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

• Add disk to array:

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

• Show RAID info:

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

• Reset disk by deleting RAID metadata:

sudo mdadm --zero-superblock {{/dev/sdXN}}