The vdisk server currently exports ZFS volumes to the vdisk client
as a slice. It retains the EFI label contained within the volume
and does not allow changing it via vdc. This support is sufficient
to mount and use the data in the ZFS volume.
In order to be able to netinstall to a vdisk backed by a ZFS
volume, vds will nned to export a ZFS volume as a raw disk and
allow writing a VTOC to a ZFS volume.