There are some more requirements, not all of them documented in the PowerCLI Reference.
You might want to have a look at Cody's post What’s New in vSphere 7.0 Storage Part III: GuestInfo VirtualDiskMapping Linux, PowerCLI support
He lists his conclusion at the end of the post.
Blog: lucd.info Twitter: @LucD22 Co-author PowerCLI Reference