def attach_to(vg)
      Common.run!(Common.cmd(:vgextend),
          :params => [vg.name, @device_name])
      self.volume_group = vg
      self
    end
def attach_to(vg)
      Common.run!(Common.cmd(:vgextend),
          :params => [vg.name, @device_name])
      self.volume_group = vg
      self
    end
other fields available
 internal physical volume number (obsolete)
 physical volume status
 physical volume (not) allocatable
 current number of logical volumes on this physical volume
 physical extent size in kilobytes
 total number of physical extents
 free number of physical extents
 allocated number of physical extents