Difference between revisions of "Talk:Raid:Manual Rebuild"

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[[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
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== HowTo: Remove a disk from the RAID1 Array from the command Line ==
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=== Look at the mdstat ===
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First we must determine which drive is in default.
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[root@sme8-64-dev ~]# cat /proc/mdstat
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Personalities : [raid1]
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md1 : active raid1 sdb1[1] sda1[0]
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      104320 blocks [2/2] [UU]
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md2 : active raid1 sdb2[2](F) sda2[0]
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      52323584 blocks [2/1] [U_]
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unused devices: <none>
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(S)= Spare
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(F)= Fail
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[0]= number of the disk
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{{notebox|as we can see the partition sdb2 is in default, we can see the flag: sdb2 [2] (F)
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we need to resynchronize the disk sdb to the existing raid md2.}}
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=== Fail and remove the disk, '''sdb''' in this case ===
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[root@ ~]# '''mdadm --manage /dev/md2 --fail /dev/sdb2'''
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mdadm: set /dev/sdb2 faulty in /dev/md2
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[root@ ~]# '''mdadm --manage /dev/md2 --remove /dev/sdb2'''
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mdadm: hot removed /dev/sdb2
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[root@ ~]# '''mdadm --manage /dev/md1 --fail /dev/sdb1'''
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mdadm: set /dev/sdb1 faulty in /dev/md1
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[root@ ~]# '''mdadm --manage /dev/md1 --remove /dev/sdb1'''
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mdadm: hot removed /dev/sdb1
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=== Do your Disk Maintenance here ===
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At this point the disk is idle.
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[root@sme8-64-dev ~]# cat /proc/mdstat
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Personalities : [raid1]
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md1 : active raid1 sda1[0]
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      104320 blocks [2/1] [U_]
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md2 : active raid1 sda2[0]
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      52323584 blocks [2/1] [U_]
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unused devices: <none>
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{{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.}}
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=== Add the partitions back ===
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[root@ ~]# '''mdadm --manage /dev/md1 --add /dev/sdb1'''
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mdadm: hot added /dev/sdb1
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[root@ ~]# '''mdadm --manage /dev/md2 --add /dev/sdb2'''
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mdadm: hot added /dev/sdb2
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=== Another Look at the mdstat ===
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[root@ ~]# '''cat /proc/mdstat'''
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Personalities : [raid1]
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md2 : active raid1 sdb2[2] sda2[0]
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      488279488 blocks [2/1] [U_]
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      [=>...................]  recovery =  6.3% (31179264/488279488) finish=91.3min speed=83358K/sec
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md1 : active raid1 sdb1[1] sda1[0]
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      104320 blocks [2/2] [UU]
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unused devices: <none>

Revision as of 22:17, 6 February 2013

Please see my remarks at User_talk:Davidbray — Cactus (talk | contribs)  16:48, 19 March 2010 (UTC)

Thanks Cactus - I've made some changes here so look forward to your feedback

HowTo: Write the GRUB boot sector

Trex (talk) 00:26, 5 February 2013 (MST) Should add a note as per the comment 24 in this Bug re grub will not install on an unpartioned disk

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

Template:Notebox

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>

Template:Notebox



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>
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