Just wanted to mention here that Don said in the video that a filter like
config.vpxd.filter.vmfsFilter if set to true will hide the vmfs datastore and has no value in it. Actually, if you set to true it will stop you from overwriting a VMFS with VMFS. Setting it to false it will enable you to overwrite which could be bad if you never intended to do so.
Also, I think Don is very good instructor and I like his style and understanding of the technology.