Replicated back-end servers

To extend scalability features to a back-end server configuration, you can replicate the back-end servers. As is the case with replicated front-end servers, replicated back-end servers must contain web spaces that are mirror images of each other.

WebSEAL balances loads across the replicated servers by using a least-busy scheduling algorithm. This algorithm directs each new request to the server with the fewest connections already in progress.

WebSEAL also correctly fails over when a server is down and starts reusing that server after it is restarted.

If the back-end application requires its state to be maintained over several pages, stateful junctions can be used to ensure that each session returns to the same back-end server.