This is certainly not my first post about UNMAP and I am pretty sure it will not be my last, but I think this is one of the more interesting updates of late. vSphere 6.0 has a new feature that supports the ability for direct UNMAP operations from inside a virtual machine issued from a Guest OS. Importantly this is now supported using a virtual disk instead of the traditional requirement of a raw device mapping.
"Remember kids, the only difference between Science and screwing around is writing it down" -Alex Jason (made popular by Adam Savage)