Look for "New cluster view for partition DEPartition" in your logs; that's what's logged when the view changes as another node joins the group. You can also look in the jmx-console, mbean jboss:partitionName=DEPartition,service=HAPartition, attribute CurrentView. Getting the message you reported on both nodes is a bit odd, unless you started both nodes at the same time (w/in say 5 seconds of each other). If you start both nodes at the same time, you can get that as neither node has started so neither can be discovered by the other, leading each to form a one-node group. The JGroups MERGE2 protocol (http://www.jboss.org/community/docs/DOC-10896) eventually detects this and combines the 2 one-node groups into a single group. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4214620#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...