mdadm Cheatsheet
Scan a system for RAID arrays and save findings so the array reappears across reboots:
1 | # mdadm --detail --scan >> /etc/mdadm/mdadm.conf |
Create a RAID5 array out of sdm1, sdj1, and a missing disk (all partitioned with raid-autodetect partitions)
1 | # mdadm --create /dev/md1 --level=5 --raid-devices=3 /dev/sd[mj]1 missing |
Create a RAID1 array
1 | # mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sd[ts]1 |
Remove a RAID array
1 2 | # mdadm --stop /dev/md1 # mdadm --zero-superblock /dev/sd[ts]1 |
Replace a failed drive that has been removed from the system
1 | # mdadm /dev/md3 --add /dev/sdc1 --remove detached |
Categories: file systems