If you have less than three nodes, pacemaker shuts down HA.
Workaround:
To restore HA, add a third node with `ganesha-ha.sh --add $path-to-config $node $virt-ip
I just tried using the latest build (3.7.1-10.el6rhs) and was able to delete two nodes from a four node cluster. I was then able to add them both back, and delete a node again.
But--- If you start with a four node cluster and delete two nodes, you will no longer have quorum and pacemaker will shut down HA.