VMware I/O Analyzer

http://labs.vmware.com/flings/io-analyzer

"I/O Analyzer is a virtual appliance solution by VMware that provides a simple and standardized way of measuring storage performance in a VMware vSphere virtualized environments. I/O Analyzer automates the traditional storage performance analysis cycle and reduces the performance diagnosis time from days to hours."

Going to test this out in the lab, looks really interesting - might be able to help with benchmarking how the Openfiler box does (or at least VMs running on the OF).

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