I've finished my setup of a two-node cluster running SLES 11 HAE for a campus system. It provides a loadbalancer with shared Apache Jackrabbit cache for a JBoss cluster running a proprietary application and Jackrabbit.

Packmaker proved to be the way to go in modern cluster deployments as it provides a solid base for heartbeat with it's OCF framework and it integrates OCFS2/O2CB to a full degree.