There is a difference between system architecture and application
architecture. While it is acceptable for the system architecture to place
the EJB tier and the web tier on the same network node, there should be
nothing in the application architecture which requires or depends on this
system architecture. Your application architecture should allow the
redeployment of the web tier and the EJB tier onto separate network nodes
without requiring ANY code changes.
>This (and many other posts like it) seem to assume an architecture
>in which the web tier and app server tier are on separate machines
>It has been suggested to me to use an architecture with those two
>logical tiers on the same physical machines with a HA database
>system running on another set of machines.
>
>Is there any reason to avoid that architecture? Surely the
>emphasis on network chatter would be between the app server and
>the database server.
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