Which quorum configurations are available in Windows Server 2008 failover clusters?

• A. Node majority
• B. Disk majority (disk witness)
• C. Node and Disk majority
• D. All of the above

Answer: (D)

Quorum decides which subset of the cluster must be online to keep the group running. In Windows Server 2008 failover clusters you can configure three viable quorum modes: Node majority, Disk majority (disk witness), and Node and Disk majority. Node majority relies only on the voting nodes themselves, requiring a majority of those node votes to be online. Disk majority adds a disk witness to break ties, allowing a cluster with an even number of nodes to stay up as long as the disk witness is available. Node and Disk majority combines both node votes and the disk witness, offering the most fault tolerance by needing a majority across all votes (nodes plus disk). Since all three options are supported, all of the above configurations are available.