Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2006-11-29

Cluster continuous replication (CCR) uses the Cluster service to help manage a Mailbox server to automatically recover from failures. When provided with redundant hardware, CCR can automatically recover from several types of complete failures. For more information about recovery actions for different kinds of failures, see Cluster Continuous Replication Recovery Behavior.

CCR uses a logical model, called the resource model, of the individual resources that make up a clustered mailbox server, such as the Microsoft Exchange Information Store service and the databases maintained by the clustered mailbox server. The resource model is represented as a tree to allow the software to define an order of actions when a piece of the model starts or stops.

Databases, the Microsoft Exchange Information Store service, and other resources can be brought online and offline manually by an administrator or automatically by the Cluster service. The term online generally refers to the process of starting a service and mounting a database. The term offline generally refers to the process of stopping a service or dismounting a database. The Cluster service tracks the online and offline states of resources in the resource model.

The resources are used as a focal point for managing the processes, databases, and network identities associated with the clustered mailbox server. The following is a brief summary of each resource type: