Now that our cluster is up and running, it needs constant and careful monitoring. In Chapter 10, "Monitoring System Resources," we discussed EMS HA Monitors. EMS HA Monitors can be configured to monitor the state of hardware resources as well as critical system resources. A Serviceguard cluster can be considered a critical system resource. As such, a cluster can be monitored from within the EMS framework to send alarms to users and/or applications such as OpenView networking monitoring tools if the cluster experiences an expected event such as a LAN card or even an entire node failing.
In Chapter 27, we look at using the Serviceguard Manager GUI to monitor cluster resources. Whatever tool you use to monitor clusters, you should review all your IT processes in order to take into account the requirements of a High Availability Cluster.
