Linux Software Raid

Revision as of 17:48, 22 May 2023 by Tony (talk | contribs) (→‎Re-add disk to array)
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Scan devices

mdadm --examine --scan --verbose /dev/sda2 /dev/sdb2 /dev/sdc2

Stop array

mdadm --stop /dev/md0

Re-add disk to array

mdadm /dev/md0 --re-add /dev/sdc1

What the howto and man mdadm don't tell

Checking the raid units

From man md:

echo check > /sys/block/md0/md/sync_action

check /proc/mdstat for status, and then set back to idle:

echo idle > /sys/block/md0/md/sync_action

Looking at your raid units

cat /proc/mdstat
mdadm --detail /dev/md0

(also shows what's going on when checking/resynching)

Hotswapping (scsi) disks

eject -s /dev/sda