Is there a way to convert an active LV on a clustered VG to an exclusive
lock without deactivating it first? Or some way of taking a snapshot of
a clustered LVM? I know I have read snapshots are not possible on CLVM,
but the information seems outdated.
ha node1: /dev/vg_clus/logvol_clus
ha node2: /dev/vg_clus/logvol_clus
1) I can deactivate the the entire vg on node1 and node2 with 'vgchange
-an vg_clus' and activate with -ay. Just stating cluster vg is working.
2) I can deactivate locally on node2 with 'vgchange -aln vg_clus' , it
shows inactive on node2 and active still on node1
- After deactivating, I cannot get exclusive lock on node1 with
'vgchange -aey vg_clus'
I get an error locking on node1
3) I can get exclusive an lock if I deactivate the VG on both nodes and
then run 'vgchange -aey vg_clus' on either node. The lvcreate snapshop
works, but again, it requires deactivating the vg, which isn't an option
in production.
Setup:
Centos 6.3 (current)
cman+pacemaker dual primary drbd for HA KVM w/ live migration
disk: lvm -> drbd -> clvm -> kvm virt
Currently I am taking a lvm snapshot of the drbd lvm backing device, but
it's not ideal ( as there are other issues )
Thanks for the time!
-Rob
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