Linux Software Raid: Difference between revisions
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=Links= | =Links= | ||
*[https://raid.wiki.kernel.org/index.php/A_guide_to_mdadm A guide to mdadm] | |||
*[https://raid.wiki.kernel.org/index.php/Mdstat mdstat] | |||
*[https://www.snel.com/support/how-to-use-mdadm-to-manage-software-raid-disc-arrays/ How to use MDADM to manage software RAID disc arrays] | |||
*[https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04 How To Manage RAID Arrays with mdadm ] | |||
*[[RAID]] | |||
*[http://tldp.org/HOWTO/Software-RAID-HOWTO.html Software RAID Howto] | *[http://tldp.org/HOWTO/Software-RAID-HOWTO.html Software RAID Howto] | ||
*[http://www. | *http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID | ||
*[ | *[http://www.snia.org/tech_activities/standards/curr_standards/ddf/ COMMON RAID DISK DATA FORMAT (DDF)] | ||
*[http://www.mepis.org/docs/en/index.php/Software_RAID_mirror Switching to mirroring] | |||
*http://www.sanitarium.net/golug/Linux_Software_RAID.html | |||
*[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= | |||
==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 | |||
==List devices== | |||
Just | |||
cat /proc/mdstat | |||
=What the howto and man mdadm don't tell= | =What the howto and man mdadm don't tell= | ||
| Line 10: | Line 36: | ||
echo check > /sys/block/md0/md/sync_action | echo check > /sys/block/md0/md/sync_action | ||
check /proc/mdstat for status, and then set | check /proc/mdstat for status, and then set back to idle: | ||
echo idle > /sys/block/md0/md/sync_action | echo idle > /sys/block/md0/md/sync_action | ||
| Line 16: | Line 42: | ||
==Looking at your raid units== | ==Looking at your raid units== | ||
cat /proc/mdstat | cat /proc/mdstat | ||
mdadm --detail /dev/md0 | |||
(also shows what's going on when checking/resynching) | (also shows what's going on when checking/resynching) | ||
==Hotswapping (scsi) disks== | ==Hotswapping (scsi) disks== | ||
eject -s /dev/sda | eject -s /dev/sda | ||
Latest revision as of 14:41, 15 April 2024
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 --re-add /dev/sdc1
List devices
Just
cat /proc/mdstat
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
