you need to use an allocationSize of 1 and for the records, SequenceHiLoGenerator is perfectly fine in an cluster :-) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961614#3961614 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3961614