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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 configuration files.
When the Veritas Cluster ServerVCS engine 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 and 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 had restarts the agent.
Note
The VCS engine process is known as "had." The acronym stands for "high-availability daemon."