The regions as the unit of granularity for a PartitionGroup can be very helpful as well. For example, one thing that could be useful would be picking separate PartitionGroup per session. Effect of this is session copies for an "owner" are distributed around the cluster, rather than all on one or two nodes. With that, the session mgmt layer can work with the load balancer to provide info about who the preferred failover target is, without having to worry that upon failure that target is going to have to take over the workload of 100% of the failed node's sessions. (Note there's no need to have a "PartitionGroup per session". You just have enough regions/PartitionGroups to adequately divide the failover load and then organize how the sessions are cached accordingly.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4061397#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...