Thanks for your reply. The asynchronously replication doesn't seem to be the problem. Even after changing to REPL_SYNC the replication doesn't happen. configuration part: ... false true 15000 15000 10000 true true ... I use the methods registerClassLoder and activateRegion to activate the replication. I'm not sure if the configuration is the problem. In other cases of smaller cache nodes the replication works fine. But in the other cases I cache smaller object and not big Maps. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4174976#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...