Hotplug
From Linux Raid Wiki
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(→mdadm versions < 3.1.2) |
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=mdadm versions < 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 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= | =mdadm versions > 3.1.2= | ||
(to be finished) | (to be finished) | ||
Revision as of 07:05, 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 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)
