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We are working on setting up AlwaysOn Availability Group for SQL Server 2014.

There will be 2 nodes: Primary Replica and Secondary Replica.

The question is, do we need a separate server for Quorum?

  • All the Windows Servers are in Azure.
  • As of now nothing is in place.
  • The vendor stated that they will add a server for maintaining quorums.
  • All servers for the complete system will be in same domain.
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Couple of points of clarification. Nodes and replicas are not the same thing. Nodes refer to the Windows Failover cluster and replicas to AvailabilityGroup instances. So assuming you are running a 2 node WSFC, each hosting a SQL instance in an AvailabilityGroup, then yes, you will need another server to achieve quorum and avoid split brain behavior. The easiest way to achieve this is simply set up a quorum file on another server outside of the cluster, known as Node and File Share majority. Read more on WSFC Quorum Modes.

You don't necessarily need to commission a new server for this. Any server outside of the server will work.

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