Configuration Concepts

Configuring VCS means conveying to the VCS engine the definitions of the cluster, service groups, resources, and resource dependencies. VCS uses two configuration files in a default configuration:

• The main.cf file defines the entire cluster.
• The types.cf file defines the resource types.

By default, both files reside in the directory /etc/VRTSvcs/conf/config. Additional files similar to types.cf may be present if agents have been added, such as Oracletypes.cf.

In a VCS cluster, the first system to be brought online reads the configuration file and creates an internal (in-memory) representation of the configuration. Systems brought online after the first system derive their information from systems running in the cluster. You must stop the cluster while you are modifying the files from the command line. Changes made by editing the configuration files take effect when the cluster is restarted. The node on which the changes were made should be the first node to be brought back online.