Hi,
If you're new to the VMware API/SDK's, first take a look at this document:
Here is a great page to get started with performance monitoring with VMware API/SDKs:
You'll want to get familiar with the performanceManager managed object:
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William Lam
VMware vExpert 2009
VMware ESX/ESXi scripts and resources at:
VMware Code Central - Scripts/Sample code for Developers and Administrators
VMware Developer Comuunity
Twitter: @lamw
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