How do these tool determine whether we have a partition, or whether some members just crashed ? Nothing different from what we want to do: they need a deterministic decision, e.g. through an independent arbiter: shared file system, DB, or separate network, or through majority decision as discussed before. In other words, those tools won't solve the problem for us, either. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4079669#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...