Posting on behalf of our server admin:

We have been running 2 instances inside one cluster on each one of our BIG-IP
load balanced servers. Each server has 4 GB of memory.

With these new dual chip ? dual-core Dell?s we have been purchasing (like
having 4 processors per physical server), was going to run 4 instances per
server (each server has 8GB of memory).

I?m trying to figure out the best way to configure these instances and can?t
find much information.

Options:

4 instances all in one cluster: seems like there would be too much
replications going on. We currently enable sticky sessions ? round robin.

2 clusters with 2 instances each: Seems like this would work but how do I
distribute the incoming sessions between the two clusters? Do I just add both
clusters in the Web server configuration tool and the connector automatically
distributes the sessions?

Is there a better option? I?m looking to see what other are doing with some
of this new hardware. With the new Dell Quad-core that just came out, is anyone
running 8 or more instances and how are they configured?

Thanks for your help.