Linux Software Raid: Difference between revisions
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*[https://unix.stackexchange.com/questions/332061/remove-drive-from-soft-raid Remove a disk from soft raid] | *[https://unix.stackexchange.com/questions/332061/remove-drive-from-soft-raid Remove a disk from soft raid] | ||
*[https://www.thomas-krenn.com/en/wiki/Mdadm_recovery_and_resync Mdadm recovery and resync] | |||
=HOWTO= | =HOWTO= | ||
Revision as of 16:27, 22 May 2023
Links
- A guide to mdadm
- mdstat
- How to use MDADM to manage software RAID disc arrays
- How To Manage RAID Arrays with mdadm
- RAID
- Software RAID Howto
- http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID
- COMMON RAID DISK DATA FORMAT (DDF)
- Switching to mirroring
- http://www.sanitarium.net/golug/Linux_Software_RAID.html
HOWTO
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 -a /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
