VMware I/O Analyzer is a virtual appliance designed to provide storage performance in a virtual environment. It is offered as a SUSE appliance that provides a web GUI to interact with.
I deployed I/O Analyzer in my vSphere 6.0 environment to see the performance of VSAN 6 compared to my Synology NAS. With this post you should be able to deploy I/O Analyzer in its simplest form and perform performance testing on your storage.