Although I have considerable experience in application servers (WebLogic and Apache Tomcat above), this is the first entry I’ll do about it.
JBoss version 7 can say that is impressive (http://www.jboss.org/jbossas) regarding version 6. Everything is much more organized and allows the creation of domains and server groups where deploy / maintain applications centrally.
In this case we will have to install a domain JBoss 7 prepared for high availability and replication session (later configure a balancer to test this).
The official documentation on: