ESX can access a designated NFS volume located on a NAS server, mount the volume, and use it for its storage needs. You can use NFS volumes to store and boot virtual machines in the same way that you use VMFS datastores.

ESX supports the following shared storage capabilities on NFS volumes:

vMotion

VMware DRS and VMware HA

ISO images, which are presented as CD-ROMs to virtual machines

Virtual machine snapshots