'find CIM instance about service information.'

def _find_eternus_service(self, classname):

    LOG.debug('_find_eternus_service,    classname:    %s.', classname)
    try:
        services = self._enum_eternus_instance_names(six.text_type(classname))
    except Exception:
        msg = (_('_find_eternus_service,    classname:    %(classname)s,    EnumerateInstanceNames,    cannot    connect    to    ETERNUS.') % {'classname': classname})
        LOG.error(msg)
        raise exception.VolumeBackendAPIException(data=msg)
    ret = services[0]
    LOG.debug('_find_eternus_service,    classname:    %(classname)s,    ret:    %(ret)s.', {'classname': classname, 'ret': ret})
    return ret
