I/O Analyzer from VMware Labs

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.

Features

• Integrated framework for storage performance testing
• Readily deployable virtual appliance
• Easily configure and launch I/O tests on multiple hosts
• View integrated performance results at both guest and host levels
• Easily export performance data for off-site analysis

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

You need to have the following system requirements:

• ESX 3.5 above (4.0 and 4.1 tested)
• 350 MB storage space
• 1 vcpu and 512 MB virtual memory
• Firefox and Chrome browsers supported