With VMFS-6, space reclamation is now an automatic, but asynchronous process. This is great because, well you don’t have to worry about running UNMAP anymore. But since it is asynchronous (and I mean like 12-24 hours later asynchronous) you lose the instant gratification of reclamation.
So you do find yourself wondering, did it actually reclaim anything?
Besides looking at the array and seeing space reclaimed, how can I see from ESXi if my space was reclaimed?