Although most network administrators will at some point have a desire to stress test their file servers to see the potential for how much of a user load a server can take, most will never do so because it’s never really been that practical. Microsoft recognized this problem and responded by creating its File Server Capacity Tool (FSCT).
FSCT can be used to identify server bottlenecks, provide statistics for server throughput, and to estimate the total number of users a server can support. Although Microsoft designates that this is not a capacity “planning” tool, there is nothing to say that it can’t really be use to help establish baselines for how certain servers should perform in planning for network installations and upgrades.
FSCT can be downloaded from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=0B212272-1884-4AF1-972D-42EF1DB9F977&displaylang=en