traffic load balanced to CAS server very unevenly
Customer has a pair of ISA to terminate HTTPS connections for the 3 backend CAS servers. LTM is located between ISA and CAS. So below setup.
client -------> ISA --------> LTM ----------> CAS
HTTPS HTTP HTTP
The VS for the HTTP connection is configured with cookie persistence, and source address persistence as fallback. Also it is configured with a oneconnect profile. Actually we followed the deployment guide "Deploying F5 with Microsoft Exchange Server 2010" for the configuration.
Now we found that 1 server is only having a few current connections, while another one has several hundreds.
I created a support case in F5 and the engineer said that this is expected behaviour since we use oneconnect profile.
Customer should need the traffic to load balance more evenly. But now it is not even close.
How should I deal with that?