Continuous availability prevents data loss in the event of one or more node failures. This mode requires one witness node, one primary node, and one data node divided across two fault domains. The witness node lies outside the fault domains. By default, the primary node is assigned to Fault Domain 1. The data node becomes the replica node and is assigned to Fault Domain 2. The primary node and the replica node create a pair. The number of data nodes including the primary node should always be an even number not exceeding 16. Each data node added to Fault Domain 1 must have a pair in Fault Domain 2 to preserve and replicate data that is added to its peer.
