anonymous wrote : But this does not explain how an failover works with an MDB MDB's are outside the scope of JBM. You can find more information from the app server guys or the app server docs. anonymous wrote : | You should have if a node crashes, the other must do the work. Messages should not be left unprocessed in a (local) queue anonymous wrote : | | Messages will never be left unprocessed, The MDB on node A will consume messages from the queue on node A, and the MDB on node B from the queue on node B. If node A goes down, its state is replicated on node B so the messages will then be consumed on node B. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4162765#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...