VMware IOInsight Fling

VMware IOInsight is a tool to help people understand a VM's storage I/O behavior. By understanding their VM's I/O characteristics, customers can make better decisions at storage capacity planning and performance tuning. IOInsight ships as a virtual appliance that can be deployed in any vSphere environment and an intuitive web-based UI allows users to choose VMDKs to monitor and view results.

https://labs.vmware.com/flings/ioinsight

https://www.vladan.fr/how-to-use-vmware-ioinsight-free-io-testing-tool/