Categories of resources
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Categories of resources

Different types of resources require different levels of control. In VCS there are three categories of resources:

• On-Off. VCS starts and stops On-Off resources as required. For example, VCS imports a disk group when required, and deports it when it is no longer needed.
• On-Only. VCS starts On-Only resources, but does not stop them.

  For example, VCS requires NFS daemons to be running to export a file system. VCS starts the daemons if required, but does not stop them if the associated service group is taken offline.

• Persistent. These resources cannot be brought online or taken offline. For example, a network interface card cannot be started or stopped, but it is required to configure an IP address. A Persistent resource has an operation value of None. VCS monitors Persistent resources to ensure their status and operation. Failure of a Persistent resource triggers a service group failover.