This VMware appliance uses the tool IOmeter, which is designed to test storage I/O - HDD, SSD, SAN, etc. When testing networked storage arrays across a SAN, your test results' numbers (throughput, latency, etc.) will of course include the storage area network's numbers in addition to the testing host's numbers and the storage array's numbers, so the latency in this case will be total latency of all systems and the throughput in this case will not exceed the smallest bottleneck in the system from the virtual appliance down to the disk and back.
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