I am a bit confused.
yesterday I finished a svMotion from NFS and back to VMFS(5) and I noticed no space has been Reclaimed.
So either I am misreading your post or something else goes wrong.
That is why I asked that zeroing needs to be done because if not, you won't have any zero'd data.
I have enough free space on my storage as the thin vmdk has already been inflated.
So now I am running a zeroing command (dd if/dev/zero .... because this machine is linux)
when this command is finished I will then do a svMotion to the NFS and Back again.
Anyway, many thanks for the input.