There is a new whitepaper, Sun Glassfish Enterprise Server High Availability Configurations for Virtualized Environment , which covers app server high availability in a virtualized environment. Sun GlassFish Enterprise Server v2 includes advanced high availability features that enable enterprises to deploy GlassFish in business-critical environments. This white paper provides valuable insights into possible reference topologies that meet a variety of deployment needs from a high availability perspective in a virtualized environment.