disaster recovery support in ejabberd

I have 2 ejabberd server nodes(A and B) in cluster. Both the nodes are in same subnet and the DB is also being replicated.
My requirement is to support Disaster recovery. For this i have to Add two more nodes(C and D) in the cluster with different subnet, so that if the first subnet fails that is both A and B fail then the services can be provided by C and D.

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