From VMWARE KB "Frequently Asked Questions for vStorage APIs for Array Integration (1021976)" :  This will list all visible devices with their capabilities : esxcli storage core device vaai status get  esxtop will show statistics for VAAI operations too. It's kinda difficult to find at first - press u for disk device, then f to select fields. The VAAI stats are not visible by default, you need to press o and p :  O:  VAAISTATS= VAAI Stats P:  VAAILATSTATS/cmd = VAAI Latency Stats (ms)
Is there a way to prove that VMware is using VAAI on a LUN attached to a VMAX? I'm going to start using thin LUNs on the disk array but want to be absolutely sure that VMware has VAAI active on the LUN. Maybe even a command on the vSphere side.
VMAX and vSphere 5.5 VAAI