The hardware acceleration functionality works only if you use an appropriate host and storage array combination.
|ESXi||Block Storage Devices||NAS Devices|
|ESXi||Support T10 SCSI standard, or block storage plug-ins for array integration (VAAI)||Support NAS plug-ins for array integration|
Note: If your SAN or NAS storage fabric uses an intermediate appliance in front of a storage system that supports hardware acceleration, the intermediate appliance must also support hardware acceleration and be properly certified. The intermediate appliance might be a storage virtualization appliance, I/O acceleration appliance, encryption appliance, and so on.