2.9 Monitoring a cluster
The EADS servers in a cluster send heartbeats (packets distributed within the cluster) to notify each other that they are running normally. If there is an EADS server that does not send heartbeats, the other EADS servers in the cluster check whether that EADS server is alive. This is called cluster monitoring.
With cluster monitoring, the user can tune the speed at which errors are detected, by specifying settings such as the heartbeat interval.