Cluster Configuration Repository (CCR)

The CCR uses a two-phase commit algorithm for updates: An update must be successfully completed on all cluster members or the update is rolled back. The CCR uses the cluster interconnect to apply the distributed updates.

Although the CCR consists of text files, never edit the CCR files yourself. Each file contains a checksum record to ensure consistency between nodes. Updating CCR files yourself can cause a node or the entire cluster to stop working.

The CCR relies on the CMM to guarantee that a cluster is running only when quorum is established. The CCR is responsible for verifying data consistency across the cluster, performing recovery as necessary, and facilitating updates to the data.