Load balancing for the application nodes in BOBJ automatically happens - there's not really anything you can do to modify it. I don't know that it's exactly round-robin - it may have it's own internal logic to determine what goes to which node. To verify that it's occurring (which I've never had to do with any of my clients in the last 8 years), you can check the metrics on the various servers.
To test fail-over of the nodes, just stop the SIA on one of the servers while one or more users are logged in to the system. Before you do this, make sure that you have configured the cluster for the web applications - logging in to a specific server from the web apps or any of the desktop apps may cause fail-over to fail for that session.
If you're running Tomcat and the web apps on the same servers as the nodes, you'll need a separate load balancer to handle that. You would test this the same way you test anything through the load balancer.
-Dell
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