private void peerScan() throws ActiveFencingException {
Date cutTime = DateUtil.currentGMTTime();
Profiler profiler = new Profiler();
profiler.start();
Profiler profilerQueryActiveList = new Profiler();
profilerQueryActiveList.start();
List<ManagementServerHostVO> currentList = _mshostDao.getActiveList(new Date(cutTime.getTime() - HeartbeatThreshold.value()));
profilerQueryActiveList.stop();