put your MDB jar in the deploy-hasingleton directory. Then it will only be deployed on one machine in the cluster. If that node in the cluster goes down, the MDB will be deployed on another machine. BTW, I'm looking for somebody to help maintain this RAR. If you're interested, email me at bill(a)jboss.org with the subject "Quartz RAR" Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3970767#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...