VCS uses the following two configuration files in a default configuration:
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 that are brought online after the first system derive their information from systems that are in the cluster.
You must stop the cluster if you need to modify the files manually. Changes made by editing the configuration files take effect when the cluster is restarted. The node where you made the changes should be the first node to be brought back online.