docs: def _offline_fcp_device(self, fcp, target_wwpn, target_lun, multipath):
          """rhel offline zfcp. sampe to all rhel distro."""
          offline_dev = 'chccwdev -d %s' % fcp
          delete_records = self._delete_zfcp_config_records(fcp,
                                                            target_wwpn,
                                                            target_lun)
          return '\n'.join((offline_dev,
                            delete_records))