Hi,
With CLVM / HA-LVM on a 2 node cluster -
Is it possible to have a shared VG but separate LVs, with each LV
exclusively activated on different nodes in a 2 node cluster.
In case of a failure, the LV of the failed node will be activated on
the other node.
I think clvm can do what you want if you perform LVM commands by hand.
But, with HA cluster manager (pacemaker) you cannot
do it with the current resource agents (clvm + LVM) [1] [2], because
they do failover at a VG basis.
We are currently working on new resource agents [3] for lvmlockd [4].
The new agents can do activation on LV basis, but I won't
recommend doing that if there's no strong reason. It makes things much
more complicated.
[1]
https://github.com/ClusterLabs/resource-agents/blob/master/heartbeat/clvm
[2] https://github.com/ClusterLabs/resource-agents/blob/master/heartbeat/LVM
[3] https://www.redhat.com/archives/linux-lvm/2017-January/msg00025.html
[4] https://github.com/ClusterLabs/resource-agents/pull/1040
Eric
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