RAID upgrade

From ThorxWiki
(Difference between revisions)
Jump to: navigation, search
(first writeup)
 
(seso)
Line 1: Line 1:
 
I have filesystems on LVMs on RAIDs on partitions. Updating a disk is then, arguably, rather non-trivial. These are my notes-to-self. Maybe they'll help you too?
  
I have filesystems on LVMs on RAIDs on partitions. Updating a disk is then, arguably, rather non-trivial. These are my notes-to-self. Maybe they'll help you too?
   
−
My setup:
+
== My system ==
−
# cat /etc/debian_version
+
<pre>
−
lenny/sid
 +
# cat /etc/debian_version
−
# uname -a
 +
lenny/sid
−
Linux falcon 2.6.18-6-amd64 #1 SMP Mon Jun 16 22:30:01 UTC 2008 x86_64 GNU/Linux
 +
# uname -a
−
# mdadm --version
 +
Linux falcon 2.6.18-6-amd64 #1 SMP Mon Jun 16 22:30:01 UTC 2008 x86_64 GNU/Linux
−
mdadm - v2.5.6 - 9 November 2006
 +
# mdadm --version
−
# lvm version
 +
mdadm - v2.5.6 - 9 November 2006
−
LVM version: 2.02.07 (2006-07-17)
 +
# lvm version
−
Library version: 1.02.08 (2006-07-17)
 +
LVM version: 2.02.07 (2006-07-17)
−
Driver version: 4.7.0
 +
Library version: 1.02.08 (2006-07-17)
  +
Driver version: 4.7.0
  +
</pre>
   
  +
== My setup ==
  +
<pre>
  +
  +
# cat /proc/mdstat
  +
Personalities : [raid1] [raid6] [raid5] [raid4]
  +
md3 : active raid5 sda4[0] sdd4[3] sdc4[2] sdb4[1]
  +
2637302400 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
  +
  +
md2 : active raid1 sdc3[0] sdd3[1]
  +
87891520 blocks [2/2] [UU]
  +
  +
md0 : active raid1 sda2[0] sdb2[2](S) sdd2[3](S) sdc2[1]
  +
8787456 blocks [2/2] [UU]
  +
  +
md1 : active raid1 sda3[0] sdb3[1]
  +
87891520 blocks [2/2] [UU]
  +
  +
unused devices: <none>
  +
  +
# pvs
  +
PV VG Fmt Attr PSize PFree
  +
/dev/md1 volgrp_home lvm2 a- 83.82G 0
  +
/dev/md2 volgrp_home lvm2 a- 83.82G 27.63G
  +
/dev/md3 volgrp_shared lvm2 a- 2.46T 0
  +
  +
# vgs
  +
VG #PV #LV #SN Attr VSize VFree
  +
volgrp_home 2 1 0 wz--n- 167.63G 27.63G
  +
volgrp_shared 1 1 0 wz--n- 2.46T 0
  +
  +
# lvs
  +
LV VG Attr LSize Origin Snap% Move Log Copy%
  +
lv_home volgrp_home -wi-ao 140.00G
  +
lv_shared volgrp_shared -wi-ao 2.46T
  +
  +
</pre>
   
 
== Hot removing a disc from a raid1 ==
 
== Hot removing a disc from a raid1 ==
 
(spares already available)
  
(spares already available)
−
+
<pre>
−
mdadm --fail /dev/md0 /dev/sda2
 +
# mdadm --fail /dev/md0 /dev/sda2
−
mdadm --remove /dev/md0 /dev/sda2
 +
# mdadm --remove /dev/md0 /dev/sda2
  +
</pre>
   
 
You can watch the spares take over with
  
You can watch the spares take over with
−
cat /proc/mdstat
 +
<pre>
  +
# cat /proc/mdstat
  +
</pre>
 
This process starts immediately after the --fail.
  
This process starts immediately after the --fail.

Revision as of 12:29, 17 February 2010

I have filesystems on LVMs on RAIDs on partitions. Updating a disk is then, arguably, rather non-trivial. These are my notes-to-self. Maybe they'll help you too?

My system 

# cat /etc/debian_version 
lenny/sid
# uname -a
Linux falcon 2.6.18-6-amd64 #1 SMP Mon Jun 16 22:30:01 UTC 2008 x86_64 GNU/Linux
# mdadm --version
mdadm - v2.5.6 - 9 November 2006
# lvm version
  LVM version:     2.02.07 (2006-07-17)
  Library version: 1.02.08 (2006-07-17)
  Driver version:  4.7.0

My setup 


# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md3 : active raid5 sda4[0] sdd4[3] sdc4[2] sdb4[1]
      2637302400 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

md2 : active raid1 sdc3[0] sdd3[1]
      87891520 blocks [2/2] [UU]

md0 : active raid1 sda2[0] sdb2[2](S) sdd2[3](S) sdc2[1]
      8787456 blocks [2/2] [UU]

md1 : active raid1 sda3[0] sdb3[1]
      87891520 blocks [2/2] [UU]

unused devices: <none>

# pvs
  PV         VG            Fmt  Attr PSize  PFree 
  /dev/md1   volgrp_home   lvm2 a-   83.82G     0 
  /dev/md2   volgrp_home   lvm2 a-   83.82G 27.63G
  /dev/md3   volgrp_shared lvm2 a-    2.46T     0 

# vgs
  VG            #PV #LV #SN Attr   VSize   VFree 
  volgrp_home     2   1   0 wz--n- 167.63G 27.63G
  volgrp_shared   1   1   0 wz--n-   2.46T     0

# lvs
  LV        VG            Attr   LSize   Origin Snap%  Move Log Copy% 
  lv_home   volgrp_home   -wi-ao 140.00G
  lv_shared volgrp_shared -wi-ao   2.46T

Hot removing a disc from a raid1

(spares already available) 

# mdadm --fail /dev/md0 /dev/sda2
# mdadm --remove /dev/md0 /dev/sda2

You can watch the spares take over with 

# cat /proc/mdstat

This process starts immediately after the --fail.

Retrieved from "http://wiki.thorx.net/mediawiki/index.php?title=RAID_upgrade&oldid=5465"
Personal tools
Namespaces

Variants
Actions
Navigation
meta navigation
More thorx
Tools