ONTAP Select cluster node is presented with a datastore that is nothing more than a single LUN on which the VMFS file system has been configured. ONTAP Select provisions a set of virtual disks, or VMDKs, and treats these disks as if they were physical, locally attached spindles. ONTAP then assembles these disks into aggregates, from which volumes are provisioned and exported to clients through the appropriate access protocol.
Since that is a roadmap item I will not say anything but if you have the ability to look at VMWorld sessions, take a look at "File Services on VSAN, STO9423". That may or may not answer some of your questions! 🙂