Clustering SQL Server

Clustering SQL Server Consulting Services

If your mission-critical SQL Server should experience a motherboard failure, how long will it be down? One hour, four hours, a day, or longer? How much will this cost your business in lost sales or productivity? And perhaps even more important to you, what will it do to your stress level?
As you may already be aware, there is one way to help boost your SQL Server’s uptime, and that is by clustering SQL Servers. This way, should one SQL Server fail in the cluster, another clustered server will automatically take over, keeping downtime to minutes, instead of hours or more.  

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Types of SQL Clusters

When you decide you want to cluster SQL Server, you have a choice of configuring what is called Active/Active or an Active/Passive cluster. Each has its own pros and cons. Let’s look at each, in the context of a two-node SQL Server cluster.

An Active/Active SQL Server cluster means that SQL Server is running on both nodes of a two-way cluster. Each copy of SQL Server acts independently, and users see two different SQL Servers. If one of the SQL Servers in the cluster should fail, then the failed instance of SQL Server will failover to the remaining server. This means that then both instances of SQL Server will be running on one physical server, instead of two.

An Active/Passive SQL Server cluster refers to a SQL Server cluster where only one instance of SQL Server is running on one of the physical servers in the cluster, and the other physical server does nothing, other that waiting to takeover should the primary node should fail.

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How Does Clustering Work?

Clustering is a very complex technology, so I will focus here on the big picture. In a two-cluster node, one of the SQL Servers is referred to as the primary node, and the second one is referred to as the secondary node. In an Active/Passive cluster design, SQL Server will run on the primary node, and should the primary node fail, then the secondary node will take over. When you build a two-node cluster using Windows 2000 Advanced Server and Microsoft Clustering Service, each node must be connected to a shared disk array using either SCSI cables or fibre channel.

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