Hello,

I read the JBoss Application Server Clustering Guide version 5.0.0 beta to 
receive an impression about the failover/load balancing features provided by 
JBoss AS 5.0. The ultimate goal is to build a failsafe system on top of the AS.

But I'm not quite sure about the failover capabilities concerning entities. The 
Clustering guide says that a distributed cache can by used for entities to 
avoid db round trips. The entity manager injected by the AS uses this cache and 
so my application benefits from it. But as far as I understood I don't get any 
failsafe benefits. If the db server fails the whole systems fails, so the db is 
a single point of failure.

Is there any mechanism/system deployment to get rid of this single point of 
failure?

I guess using a high end database cluster would be one, but is there another 
solution. Perhaps using 2 separate databases and something like a replication 
mechanismen inside the AS which replicates entities across the 2 db instances?

Thanks for help,
Martin

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