tldr/pages/linux/mdadm.md

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# mdadm
> RAID management utility
- create array
`mdadm --create {{/path/to/raid_device_file}} --level {{ raid level }} --raid-devices {{ number of disks}} {{/path/to/disk_device_file}}`
- stop array
`mdadm -S {{/path/to/raid_device_file}}`
- mark disk as failed
`mdadm {{/path/to/raid_device_file}} -f {{/path/to/disk_device_file}}`
- remove disk
`mdadm {{/path/to/raid_device_file}} -r {{/path/to/disk_device_file}}`
- add disk to array
`mdadm {{/path/to/raid_device_file}} -a {{/path/to/disk_device_file}}`
- show RAID info
`mdadm -D {{/path/to/raid_device_file}}`