Understanding the Windows Server Failover Cluster Quorum in Windows Server 2012 R2

Clustering For Mere Mortals

Understanding the Windows Server Failover Cluster Quorum in Windows Server 2012 R2

Before we get started with all the great new cluster quorum features in Windows Server 2012 R2, we should take a moment and understand what the quorum does and how we got to where we are today. Rob Hindman describes quorum best in his blog post

“The quorum configuration in a failover cluster determines the number of failures that the cluster can sustain while still remaining online.”

Prior to Windows Server 2003, there was only one quorum type, Disk Only. This quorum type is still available today, but is not recommended as the quorum disk is a single point of failure. In Windows Server 2003 Microsoft introduce the Majority Node Set (MNS) quorum. This was an improvement as it eliminated the disk only quorum as a single point of failure in the cluster. However, it did have…

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