'Create a VLUN.
In order to export a volume on a 3PAR box, we have to create a VLUN.'

def create_vlun(self, volume, host, nsp=None, lun_id=None):

    volume_name = self._get_3par_vol_name(volume['id'])
    vlun_info = self._create_3par_vlun(volume_name, host['name'], nsp, lun_id=lun_id)
    return self._get_vlun(volume_name, host['name'], vlun_info['lun_id'], nsp)
