Welcome, Abhishek. I had a quick look on the Sun site to find out a bit more about Solaris Open High Availability Cluster. Seems like it's based on applications persisting state to an HA file system? Forgive me if I'm wrong; was just a quick scan. JBoss AS mostly provides HA for stateful services via data replication, rather than persistence to the file system. Main exception to this is persistent JMS messages, which are persisted to a shared db. Some links to help you get going: Clustering docs for 4.2 series (haven't updated for 5.x yet :( ) : https://www.jboss.org/file-access/default/members/jbossas/freezone/docs/C... SVN URL for AS trunk: http://anonsvn.jboss.org/repos/jbossas/trunk/ Two main locations for clustering code therein: http://anonsvn.jboss.org/repos/jbossas/trunk/cluster/ http://anonsvn.jboss.org/repos/jbossas/trunk/tomcat/src/main/org/jboss/we... Key classes inside the above two locations (can serve as an entry point for poking around): http://anonsvn.jboss.org/repos/jbossas/trunk/tomcat/src/main/org/jboss/we... (manages clustered HTTP sessions) http://anonsvn.jboss.org/repos/jbossas/trunk/cluster/src/main/org/jboss/h... (provides intra-cluster group RPC services for a lot of other clustered services) That's just a snippet; not sure what you're really looking for. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4181609#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...