Posted on November 19, 2016 at 12:02 pm
Important thing to note:
/dev/sda1: the XenServer root partition /dev/sda2: XenServer uses this partition for temporary space during upgrades /dev/sda3: your storage repository should be in this logical volume |
Show info about first disk and its partitions:
[root@server ~]# partx -l /dev/sda # 1: 2048- 20973567 ( 20971520 sectors, 10737 MB) ---> Seems to be sda1 ---> XenServer root # 2: 20973568- 41945087 ( 20971520 sectors, 10737 MB) ---> Seems to be sda2 ---> XenServer temporary space # 3: 41945088-937697279 (895752192 sectors, 458625 MB) ---> Seems to be sda3 ---> XenServer storage repository |
Show info about second disk and its partitions (same as first disk):
# 1: 2048- 20973567 ( 20971520 sectors, 10737 MB) ---> Seems to be sdb1 ---> Same partition as XenServer root (sda1) # 2: 20973568- 41945087 ( 20971520 sectors, 10737 MB) ---> Seems to be sdb2 ---> Same partition as XenServer temporary space (sda2) # 3: 41945088-937697279 (895752192 sectors, 458625 MB) ---> Seems to be sdb3 ---> Same partition as XenServer storage repository (sda3) |
Lists disks and their partitions:
[root@server ~]# ls -la /dev | grep sd brw-r----- 1 root disk 8, 0 Nov 4 23:33 sda ---> First disk brw-r----- 1 root disk 8, 1 Nov 4 23:33 sda1 ---> Partition for XenServer root brw-r----- 1 root disk 8, 2 Nov 4 23:33 sda2 ---> Partition for XenServer temporary space brw-r----- 1 root disk 8, 3 Nov 4 23:33 sda3 ---> Partition for XenServer storage repository brw-r----- 1 root disk 8, 16 Nov 4 23:33 sdb ---> Second disk brw-r----- 1 root disk 8, 17 Nov 4 23:33 sdb1 ---> Same partition as XenServer root (sda1) brw-r----- 1 root disk 8, 18 Nov 4 23:33 sdb2 ---> Same partition as XenServer temporary space (sda2) brw-r----- 1 root disk 8, 19 Nov 4 23:33 sdb3 ---> Same partition as XenServer storage repository (sda3) |
Show mdadm arrays:
[root@server ~]# mdadm -Esv ARRAY /dev/md1 level=raid1 num-devices=2 UUID=40d7e873:129b2b82:a4d2adc2:26fd5302 devices=/dev/sda1,/dev/sdb1 ARRAY /dev/md2 level=raid1 num-devices=2 UUID=fc1bbed2:004b3e79:a4d2adc2:26fd5302 devices=/dev/sda2,/dev/sdb2 ARRAY /dev/md3 level=raid1 num-devices=2 UUID=d8a08c66:36ea3172:a4d2adc2:26fd5302 devices=/dev/sda3,/dev/sdb3 |
Check mdadm status:
[root@server ~]# cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [raid10] md3 : active raid1 sda3[0] sdb3[1] 447876032 blocks [2/2] [UU] bitmap: 0/4 pages [0KB], 65536KB chunk md2 : active raid1 sda2[0] sdb2[1] 10485696 blocks [2/2] [UU] md1 : active raid1 sda1[0] sdb1[1] 10485696 blocks [2/2] [UU] unused devices: <none> |
Read mdadm stats:
md3 ---> "md" stands for "mdadm device" active ---> the mirroring of data is active raid1 ---> the type of raid (raid1 means the data of the first disk is mirrored to the second disk) sda3[0] ---> sda means first disk, 3 means the third partition, that 0 means it is on first disk (disk0) sdb3[1] ---> sdb means second disk, 3 means the third partition, that 1 means it is on second disk (disk1) [UU] ---> means both disks are fine [_U] ---> means the first disk has issues [U_] ---> means the second disk has issues |
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