How agents work

A single agent can manage multiple resources of the same type on one system. For example, the NIC agent manages all NIC resources. The resources to be managed are those defined within the VCS configuration.

When the VCSengine process,HAD comes up on a system, it automatically starts the agents required for the types of resources that are to be managed on the system.

The daemon provides the agents the specific configuration information for those resources.

An agent carries out the commands from to bring resources online, monitor their status, and take them offline, as needed. When an agent crashes or hangs, detects the fault and HADrestarts the agent.

The VCS daemon that runs on the systems hosting the applications is HAD.

The acronym stands for high-availability daemon.