def _get_source_device_path(self, fcp, target_wwpn, target_lun):
        """rhel"""
        device = '0.0.%s' % fcp
        data = {'device': device, 'wwpn': target_wwpn, 'lun': target_lun}
        var_source_device = ('SourceDevice="/dev/disk/by-path/ccw-%(device)s-'
                             'zfcp-%(wwpn)s:%(lun)s"\n' % data)
        return var_source_device