One of the hot things to buy now with a new vSphere implementation are a set of beefy hosts with the new Nehalem processor line. This is great but there is a bug you need to watch out for. Memory usage for guests are showing 80%-90% utilized when actually there will only be 30%-50% consumed within the guest VM. This can really throw you for a loop and after some research, it appears to have something to do with Transparent Page Sharing or TPS and the way it works with MMU enabled.
You can learn more about MMU and VMware here
http://blogs.vmware.com/performance/2009/03/index.html
According to a VMware communities thread I was reading, there should be a patch coming out mid to late September. In the meantime you could disable large page sharing as a workaround, however, this will cause a big loss in performance. Check out this community thread for more info as well.
http://communities.vmware.com/thread/211585;jsessionid=C282B0ADD49F2A96E3CA99A7951DC974?start=0&tstart=0
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