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In order to change your environment, what you could do is go to the Hardware tab -> Network. Within here you can create new networks and also change via the Edit this Network pencil icon what networks should manage what roles (i.e. Virtual Machine, Cluster Heartbeat, etc). In my past experience, I've had issues changing the cluster heartbeat once it has been set. If you have issues changing it, via the OVM Manager, one thing you could do is change it manually via the /etc/ocfs2/cluster.conf file. Also, if it successfully lets you change it via the OVM Manager, verify it within the cluster.conf to ensure it actually did your change. This is where that is being set. However, doing it manually can be tricky because OVM has a tendency to like to revert it's changes back to its original state say after a reboot. Of course I'm not even sure if they support you manually making that change. Ideally, when setting up an OVM environment, best practice would be to separate your networks as much as possible i.e. (Public network, private network, management network, clusterhb network, and live migration network if you do a lot of live migrating, otherwise you can probably place it with say the management network).
Hope that helps,