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The multi-instance example in figure 5.5 achieves higher resource utilization than the single-instance example presented earlier; both servers are utilized in the normal working status. Multi-instance clusters require careful consideration in terms of resource configuration. In our example, if the Sales1 and Sales2 servers each have 32GB of RAM, and both the Sales and Marketing SQL instances are using 28GB of RAM, a failover situation would see one (or both) instances with a potentially drastically reduced memory allocation after failover, a scenario I refer to as a resource crunch. To avoid this issue, configure instances so that the sum total of maximum resource usage across both (or all) instances doesn t exceed the total resources of a single node that the instances could end up running on. The two topologies we ve covered so far represent the opposite ends of the scale; single-instance clusters with a 50 percent node utilization, and multi-instance clusters with 100 percent resource utilization. In between these two lies the N+1/M cluster.

To avoid the cost of idle servers and limit the effects of a failover-induced resource crunch, a commonly used cluster configuration is an N+1/M cluster, whereby one or more standby servers exist for more than one working server. For example, in a threenode cluster, two nodes may be active, with a third existing as a failover node for both active nodes. Similarly, a five-node cluster with three active nodes and two failover nodes is a common cluster configuration. As the number of cluster nodes and SQL Server instances increases, so too does the importance of considering the failover rules governing which node(s) a SQL Server instance can fail over to.

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By regularly polling cluster nodes using a series of mechanisms called LooksAlive and IsAlive checks, a Windows cluster may conclude that a cluster node has failed. At that point the resources hosted by the node are failed over to another cluster node.

In a simple two-node cluster, the failover process is straightforward, as demonstrated in figure 5.4. But consider a five-node cluster containing two passive/standby nodes. Which (if any) of the standby nodes will be used for failover purposes when one of the active nodes fails In large clusters containing many SQL Server instances, this is a particularly important consideration in maintaining a well-balanced cluster, ensuring that a single node doesn t carry a disproportionate burden of load. Although beyond the scope of this book, there are several common strategies and techniques used in controlling failover, and central to them is the use of the Preferred Owners, Possible Owners, and Failback settings. In figure 5.6, the properties of the SQL Server resource shows the Possible Owners property. This property lets you specify which nodes the instance is permitted to fail over to. In a similar manner, the Preferred Owner setting (not shown) is used to set the preferred failover node (this may not be chosen in some situations for example, if the node is unavailable). Finally, the Failback options (not shown) let you determine whether or not resources fail back to the original node if the failed node comes back online. With this background in mind, let s continue by walking through the installation of a clustered SQL Server instance into a two-node Windows Server 2008 cluster.

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The process of installing a clustered SQL Server instance has changed since SQL Server 2005. There are now two installation options: Integrated and Advanced.

An integrated installation creates a single-node failover cluster, from which additional nodes (nodes on which the instance can fail over to) are added via a separate installation. As shown in figure 5.7, the initial and subsequent node installations are started by choosing the New SQL Server Failover Cluster Installation and Add Node to a SQL Server Failover Cluster options on the Installation tab of the SQL Server Installation Center. In contrast to the one-node-at-a-time approach of the integrated installation, the advanced installation prepares multiple-cluster nodes in one step, before completing the installation on the node chosen as the initial active node for the instance. As

Figure 5.7 Choose the New SQL Server Failover Cluster Installation option to create a single-node failover cluster before adding additional nodes with the Add Node to a SQL Server Failover Cluster option.

shown in figure 5.8, you specify this installation type by selecting the Advanced Cluster Preparation and Advanced Cluster Completion options on the Advanced tab of the SQL Server Installation Center.

Figure 5.8 Choose the Advanced Cluster Preparation and Advanced Cluster Completion options to streamline the process of installing a clustered SQL Server instance on multiple-cluster nodes.

In the previous chapter, we discussed the installation of a nonclustered SQL Server instance. Clustered installations share some of the same installation screens and steps, so rather than repeat them, let s walk through the steps unique to a clustered installation using the integrated method.

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