Great, thanks. How much memory is required or recommended for each instance? 
I'm on a Windows Server 2003 Standard Edition with 4 GB of memory (its max). 
How many instances would be recommended for that amount of memory?

>Yes.  You add one or more instances to one or more servers.  Then you define 
>a cluster, add the instances to it, and choose a load balancing algorithm. 
>You then associate that cluster with your IIS site (or apache virtual server 
>etc)
>
>In my experience, clusters can be a little cranky if you are making changes 
>to them, but once they are up they work pretty well.
>
>The main gotcha's for clustering IMO are:
>* Features that require subsequent HTTP requests to target the same initial 
>server (cfchart, cfimage)
>* Data that is specific to a users and stored in a persistent scope like 
>session or Application does not automatically follow users from once 
>instance to another.
>
>Session replication can solve the latter, but still has some problems I 
>think, and not many people seem to use it.
>Sticky sessions eliminates both problems for the most part, and seems to be 
>the most common way to handle clusters.  Of course, the failure of an 
>instance won't be helped by sticky sessions since that only sticks a users 
>to an instance as long as it is still up.
>
>~Brad
>
>> 

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