Hotplug
From Linux Raid Wiki
(Difference between revisions)
(→mdadm versions < 3.1.2) |
|||
Line 4: | Line 4: | ||
=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)