Hotplug
From Linux Raid Wiki
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# cat /proc/mdstat | # cat /proc/mdstat | ||
Personalities : [raid1] | Personalities : [raid1] | ||
| − | md0 : active raid1 sda1[2](F) sdb1[1] | + | md0 : active raid1 sda1'''[2](F)''' sdb1[1] |
3903680 blocks [2/1] [_U] | 3903680 blocks [2/1] [_U] | ||
bitmap: 0/239 pages [0KB], 8KB chunk | bitmap: 0/239 pages [0KB], 8KB chunk | ||
| − | We see that sda1 has role [2], which is "Spare disk" | + | We see that sda1 has role '''[2]''', which is "Spare disk". And it is '''(F)'''ailed. |
What we can do is remove the failed disk: | What we can do is remove the failed disk: | ||
Revision as of 07:06, 15 April 2010
HW issues of the disk hotplugging are described in the Hotswap chapter of theHardware issues page.
The Linux RAID supports hotplug operations fully from Hot-unplug branch of the mdadm version 3.1.2.
mdadm versions < 3.1.2
Let's have md0 RAID1 composed of /dev/sda1 and /dev/sdb1
If we hot-unplugged the disk /dev/sda, the /proc/mdstat would show:
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[2](F) sdb1[1]
3903680 blocks [2/1] [_U]
bitmap: 0/239 pages [0KB], 8KB chunk
We see that sda1 has role [2], which is "Spare disk". And it is (F)ailed.
What we can do is remove the failed disk:
# mdadm /dev/md3 --fail detached --remove detached mdadm: hot removed 8:1
mdadm versions > 3.1.2
(to be finished)
