Configuration Database Manager

The Configuration Database Manager implements the functions needed to maintain the Cluster Configuration Database. This database contains information about all of the physical and logical entities in a cluster. These entities are the Cluster itself, Systems, Resource Types, Groups, and Resources. Persistent and volatile information is used to track the current and desired state of the cluster. The Database Managers on each of the cluster systems cooperate to maintain configuration information consistently across the cluster. One phase commits are used to ensure the consistency of cluster data base in all nodes. The Configuration Database Manager also provides an interface to the Configuration Database for use by the other Cluster Service components. This interface is similar to the registry interface exposed by the Win32 API [3] set with the key difference being that changes made in one node of the cluster are atomically distributed to all nodes in the cluster that are affected.