sys.hMutex.RLock()
	defer sys.hMutex.RUnlock()
	if h, ok := sys.hc[ep.Host]; ok {
		return !h.Online
	}
	go sys.initHC(ep)
	return false
}

// markOffline sets endpoint to offline if network i/o timeout seen.
func (sys *BucketTargetSys) markOffline(ep *url.URL) {
	sys.hMutex.Lock()
	defer sys.hMutex.Unlock()
	if h, ok := sys.hc[ep.Host]; ok {
		h.Online = false
		sys.hc[ep.Host] = h
	}
}

			// to complete the operation.
		default:
			if err != nil && minio.IsNetworkOrHostDown(err, true) && !globalBucketTargetSys.isOffline(tgt.EndpointURL()) {
				globalBucketTargetSys.markOffline(tgt.EndpointURL())
			}
			// mark delete marker replication as failed if target cluster not ready to receive
			// this request yet (object version not replicated yet)
			if err != nil && !toi.ReplicationReady {

		if errs[i] != nil && minio.IsNetworkOrHostDown(errs[i], true) {
			ep := c.state.Peers[depID].Endpoint
			epURL, _ := url.Parse(ep)
			if !globalBucketTargetSys.isOffline(epURL) {
				globalBucketTargetSys.markOffline(epURL)
			}
		}
	}
	return c.newConcErr(errMap, actionName)
}

func (c *SiteReplicationSys) annotateErr(annotation string, err error) error {
	if err == nil {
		return nil
	}