Hi all,
I want to get clustered LV snapshotting working. I was under the
impression it was simply a matter of disabling the LV on the other node
(2-node cluster here). However, this fails because of locking issues.
I can change the peer node's LV to 'inactive' with (confirmed with
lvscan):
[root@an-c05n01 ~]# lvchange -aln /dev/an-c05n02_vg0/vm01-rhel2_0
[root@an-c05n01 ~]# lvscan
inactive '/dev/an-c05n02_vg0/vm01-rhel2_0' [50.00 GiB] inherit
But I still can't create snapshot on the other node running the VM:
[root@an-c05n02 ~]# lvcreate -L 25GiB --snapshot -n
vm01-rhel2_0_snapshot /dev/an-c05n02_vg0/vm01-rhel2_0
vm01-rhel2_0 must be active exclusively to create snapshot
So I try to set it exclusive:
[root@an-c05n02 ~]# lvchange -aey /dev/an-c05n02_vg0/vm01-rhel2_0
Error locking on node an-c05n02.alteeve.ca: Device or resource busy
If I stop the VM running on the LV, then I can set the exclusive lock,
boot the VM and later create the snapshot fine:
[root@an-c05n02 ~]# lvcreate -L 25GiB --snapshot -n
vm01-rhel2_0_snapshot /dev/an-c05n02_vg0/vm01-rhel2_0
Logical volume "vm01-rhel2_0_snapshot" created
But then later, I can't remove the exclusive value, so I can't re-active
the LV after deleting the snapshot. I have to shut the VM down again in
order to remove the exclusive flag.
I'm assuming it's possible to snapshot clustered LVs while they're in
use, without stopping what is using them twice... Can someone help
clarify what the magical incantation is?
Thanks!
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