We have consolidated some JAVA based workloads into ESXi and some performance issues found us.
Specifically, we virtualized the GE Webspace product for our manufacturing equipment and after a few concurrent users it would respond erratically - either slowly or just crash outright.
After attending a VMware support session they talked about how JAVA was one of their Top-10 support calls. Webspace is a JAVA based application.
Here is the link to the Support Best Practices from VMware for JAVA:
http://www.vmware.com/resources/techresources/1087
What I found - use the RAM reservation!!
I enabled the RAM reservation and rebooted the server and all of our performance issues went away. There are several other best practice suggestions in the document and I'm sure they will help in an environment that is more heavily utilized then ours. But for us, the RAM reservation solved the problem.
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