Understanding Windows Server Cluster Quorum Options

Overview

If you're deploying SQL Server, you are likely running business-critical applications on it and you need to ensure it's protected from downtime and data loss.

You typically have one of two options for high availability protection: Always On Availability Groups (AOAG), which was introduced with SQL Server 2012 Enterprise Edition, or Always On Failover Cluster Instances (FCI), which has long been a proven high availability solution that comes with SQL Server Standard and Enterprise Editions.

In both of those solutions, the underlying infrastructure for availability relies on Windows Server failover clustering (WSFC). They both involve running SQL Server on a primary node and setting up one or more secondary nodes and to keep things running you need to make sure your quorum settings are configured properly.

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