JBoss5.1_Clustering_Guide
Reference:
https://docs.jboss.org/jbossas/docs/Clustering_Guide/4/html/jbosscache.chapt.html
https://docs.jboss.org/jbossas/docs/Clustering_Guide/4/html/index.html
http://docs.jboss.org/jbossclustering/cluster_guide/5.1/html/
JGroup overview
http://www.jgroups.org/overview.html