'Create a THIN copy pair on the storage.'

def _create_thin_copy_pair(self, pvol, svol):

    snapshot_name = (_SNAP_NAME + six.text_type((svol % _SNAP_HASH_SIZE)))
    self.run_raidcom('add', 'snapshot', '-ldev_id', pvol, svol, '-pool', self.conf.vsp_thin_pool, '-snapshot_name', snapshot_name, '-copy_size', self.conf.vsp_copy_speed)
    try:
        self.wait_thin_copy(svol, PAIR)
        self.run_raidcom('modify', 'snapshot', '-ldev_id', svol, '-snapshot_data', 'create')
        self.wait_thin_copy(svol, PSUS)
    except exception.VSPError:
        with excutils.save_and_reraise_exception():
            interval = self.conf.vsp_async_copy_check_interval
            try:
                self._delete_thin_copy_pair(pvol, svol, interval)
            except exception.VSPError:
                utils.output_log(MSG.DELETE_TI_PAIR_FAILED, pvol=pvol, svol=svol)
