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May be you have to disable "sticky session" or "session affinity" in your load balancer.
Is the load balancing based on IP address by any chance?
If all requests are coming from a single agent they could well all be going to the same node? We have a similar issue coming from 2 agents (seperate IP addresses) but against 3 nodes.
I did (very briefly) look into using the IP Spoofing options in OLT but didn't get very far. It may be an option for you? Look in the Browser Settings of the Scenario Defaults.
Or you could also parameterize the URL to point directly to the different cluster nodes, instead of using the virtual ip.
The databank will contain all the physical IPs of the nodes
That's an interesting thought JB. I might try that myself. However wouldn't that be bypassing the load balancer i.e. not exercising it?
Yes, it will bypass the load balancer. In that case, you don't test it....