Hi Dirk:
In general people have more and more moved to using local interfaces for ejb's because it offers better performance. Components that are co-located can communicate without unnecessary network hops.
By putting both the web and ejb parts together and deploying the same thing on each cluster instance it also makes for a simpler deployment. Capacity planning will be easier too.
So in general we would advise you to keep a single homogeneous cluster.
hope this helps
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