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If you're using UDP as a transport, using different multicast addresses (jboss.default.multicast.address) for each group should do the trick.
I'm using embedded caches rather than the built in JBoss infinispan cache. I think that jboss.default.multicast.address applies only to the built in infinispan cache.
However i seem to have found a solution, by storing node names in the database i can set the System property jgroups.udp.mcast_addr before starting jgroups which keeps them separate. This parameter could alternatively be passed to each JVM.