The Failover Manager polls all configured SAM and Domain Managers and the systems on which they are running to determine their status.
Accept the default polling settings. If you modify default polling settings, you need to consider the size of your topology. For example, if the topology of the IP Manager or the Server Manager is large, you need to set the polling interval to a higher value. This is because the Managers can be unresponsive for a short duration while repository restore or reconfigure is in progress.
Monitored entities include the following:
Hosts: The systems on which the services are configured. Hosts are monitored using ICMP pings
Broker s: Broker services
Services: All Domain Managers