What is load balancer in fms cluster and how to configure it and testing fms clustering

Flash Media Server does not come bundled with a load balancer.  In theory, one deploys FMS in an edge/origin configuration like this

1 Origin ----> N Edges ------> Customer Traffic

The idea here is that N edges shoulder the load for most customers with a single origin coordinating resources like VOD content or script access.  The issue that remains is "how do I spread customers over the N edges" and that's where load balancing comes in.  Most customers use a prepackaged load balancing solution - as an Adobe staffer I can't recommend any of them over the other, but you should be able to get some recommendations here along with just googling for it.  The short answer contained here though is, you're going to have to find one outside of FMS if that's needed for your setup.

Asa