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Talk:Raid:Manual Rebuild (view source)
Revision as of 22:17, 6 February 2013
, 22:17, 6 February 2013no edit summary
[[User:Stephdl|Stephdl]] ([[User talk:Stephdl|talk]]) 12:24, 6 February 2013 (MST) ok i work on the howTo...work in progress, don't disturb :p
[[User:Stephdl|Stephdl]] ([[User talk:Stephdl|talk]]) 12:24, 6 February 2013 (MST) ok i work on the howTo...work in progress, don't disturb :p
== HowTo: Remove a disk from the RAID1 Array from the command Line ==
=== Look at the mdstat ===
First we must determine which drive is in default.
[root@sme8-64-dev ~]# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md2 : active raid1 sdb2[2](F) sda2[0]
52323584 blocks [2/1] [U_]
unused devices: <none>
(S)= Spare
(F)= Fail
[0]= number of the disk
{{notebox|as we can see the partition sdb2 is in default, we can see the flag: sdb2 [2] (F)
we need to resynchronize the disk sdb to the existing raid md2.}}
=== Fail and remove the disk, '''sdb''' in this case ===
[root@ ~]# '''mdadm --manage /dev/md2 --fail /dev/sdb2'''
mdadm: set /dev/sdb2 faulty in /dev/md2
[root@ ~]# '''mdadm --manage /dev/md2 --remove /dev/sdb2'''
mdadm: hot removed /dev/sdb2
[root@ ~]# '''mdadm --manage /dev/md1 --fail /dev/sdb1'''
mdadm: set /dev/sdb1 faulty in /dev/md1
[root@ ~]# '''mdadm --manage /dev/md1 --remove /dev/sdb1'''
mdadm: hot removed /dev/sdb1
=== Do your Disk Maintenance here ===
At this point the disk is idle.
[root@sme8-64-dev ~]# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda1[0]
104320 blocks [2/1] [U_]
md2 : active raid1 sda2[0]
52323584 blocks [2/1] [U_]
unused devices: <none>
{{notebox|You'll have to determine if your disk can be reinstated at the array. In fact sometimes a raid can get out of sync after a power failure but also some outages times for physical disk itself. It is necessary to test the hard drive if this occurs repeatedly. For this we will use smartctl.}}
=== Add the partitions back ===
[root@ ~]# '''mdadm --manage /dev/md1 --add /dev/sdb1'''
mdadm: hot added /dev/sdb1
[root@ ~]# '''mdadm --manage /dev/md2 --add /dev/sdb2'''
mdadm: hot added /dev/sdb2
=== Another Look at the mdstat ===
[root@ ~]# '''cat /proc/mdstat'''
Personalities : [raid1]
md2 : active raid1 sdb2[2] sda2[0]
488279488 blocks [2/1] [U_]
[=>...................] recovery = 6.3% (31179264/488279488) finish=91.3min speed=83358K/sec
md1 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
unused devices: <none>