State Servers
State Server is simple, free software available with ASP.NET for storing
session state data. It can be run directly on the web server, at least providing
protecting from worker-thread recycling, or it can be run in a central location
to get the full benefits of non-affinity.
Limitations of State Server:
· When using State Server remotely—every request/response pair
involves two trips to the State Server, one to retrieve the session
state data at the beginning of the generation of the response and
another to return the modified session state data when the response
is completed.
· When it fails or restarted all the session data is lost
bytescrolls.blogspot.
It also can make session-state and other fast-changing data immediately available to all servers in the farm or the compute grid