How to split presentation level and business level using two ATG instances

Hello All!
We are investigating possibility of splitting ATG presentation (web store with jsp pages and other presentation components) and business (ATG components such as Pricing, Catalog, etc.) levels. The first idea that we have is simply start two instances of ATG. One instance will serve client requests (presentation level) and communicates with another ATG instance (business level) where all ATG components are situated.
The main problem is a Nucleus container which is used for accessing all ATG components. And we don't know right solution how to point to a Nucleus container that is situated on a remote ATG instance. Right now we have two ideas how to establish communication between two ATG instances:
- try to replace local Nucleus container by remote one using RMI;
- do not replace Nucleus container by implementing some custom filter that can redirect all servlet requests to another ATG instance. In that case we will have two Nucleus containers.
What do you think about all this? Do you have any other solutions how to solve the task? Maybe we lost something? Can we deploy a cluster of ATG instances that will communicate between each other?
Thanks in advance.
Andrey.
Edited by: 945758 on Jul 11, 2012 7:00 AM

Yes ATG system can have multiple nodes grouped in one or more clusters managed by load balencer
If the services you are talking about are inherently ATG services like login, add to cart, checkout then its better to implement it with ATG.
ATG provides and support both REST and SOAP based Webservice and allows you to expose any ATG component as service thus making it available outside ATG space.
To be able to manage load better you can split your servers to page serving servers and services oriented servers and place them into multiple clusters.
Though I haven't seen anyone using this kind of topology so not sure whether it's there is any challenge in setting up this topology.

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