How many server nodes can you create per instance

Hi,
Very often the bottle neck in a java installation (NW04s) is the heap size. In order to increase the heap you simple create new server nodes.
My question is:
How many server nodes can you create per instance?
Is there an upper limit before you have to create a new dialog instance (with a web dispatcher)?
I can imagine that when you create a new server node you also have to increase the heap and max therad of the dispatcher. Is there any upper limit of the heap size of the dispatcher node ?

Rasmus , I think you laid out a real good scenario for every one to contribute
I may be very late but just updating this forum for benefit of everyone who visits this.
In addition to all the points above one must also consider following things if one decides to add more server nodes to one dispatcher
1.Garbage collection time
2.Dispatcher would keep on sending request to node S2 if it is not completely bad and there by impacting all the servernode       so  you might end up restartiing the entire cluster.
3,Debugging also becomes diffculy as you are not sure on which server node you are within the cluster.
4.If you have something like F5 which does hear beat monitoring even one server node goes bad F5 will not report anything.
So in my view one server node per dispatcher is an ideal configuration.
Over All Dispatcher does not consume more resouces (Disk Space + CPU + memory ) at the same time it will give you maintenance flexibility.
Nothing is right or wrong ,all these things are based on how your infrastructure set up is.
Cheers !!
Manish Jain

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