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The only remaining cluster-specific installation step is configuring the Cluster Security Policy. In previous versions of SQL Server, the service accounts had to be added to newly created domain groups prior to installation. Permissions for the service accounts were then managed at the domain group level. This requirement was often misunderstood, and introduced complexities when the domain groups needed to be changed. In response to this, SQL Server 2008 introduced an alternative method that uses service security identifiers (SIDs). As you can see in figure 5.14, using SIDs is the recommended configuration, although support for the old domain group method remains. The remaining steps in the installation process are the same as for the nonclustered installation described in the previous chapter. At the end of the installation, the clustered instance will be created and available, but can t fail over to other cluster nodes until you run the Add Node installation on the appropriate nodes. This installation option is used to enable additional cluster nodes to participate as failover nodes for an existing SQL Server failover clustering instance. Figure 5.15 shows one of the screens from this installation option, and in this case, we ve chosen to allow the SALES2 server to host the MARKETING instance.

Figure 5.15 In this example, the Sales2 server is installed as a failover participant for the Sales instance installed on the Sales1 server.

The curve y = x 2 goes through the points (1,l) and (2,4) so approximate the area under this curve with a triangle and trapezoid as shown in Fig 7-4 The area of the triangle is (1/2)1-1=1/2 The area of a trapezoid is (1/2)(sum of the opposite faces)(height) which in this case is (1/2)(1+ 4)(1) = 25 The sum of these areas is 3, even closer to the area of 27 obtained through the integral If this process were continued with narrower and narrower trapezoids the area would approach the 27 obtained through the integral

Figure 5.16 Use the Cluster Management tool to view and manage a clustered SQL Server instance s resources and state.

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When installation is complete, you can manage the clustered instance using the Failover Cluster Management tool in the Administrative Tools folder, or by running Cluadmin.msc from the Start menu. In the example in figure 5.16, you can manually move, or fail over, a clustered instance to another cluster node by right-clicking the resource group and selecting the Move this service or application to another node option. Failover clustering is a complex area requiring a range of skills for a successful implementation. I encourage you to visit http://www.sqlCrunch.com/clustering for links to various clustering-related resources, including how clusters use public and private networks and how to use clustering over geographic distances.

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Clustering SQL Server allows for the creation of highly available and reliable environments; however, failing to adequately prepare for a clustered installation can be counterproductive in that regard, with poorly planned and configured clusters actually reducing the availability of SQL Server. While multi-instance clusters are more cost-effective than single-instance clusters, give careful consideration to the possibility (and implications) of a resource crunch in the event of failover. N+1/M clusters offer both cost benefits and resource flexibility, but take into account the failover rules, particularly for clusters containing many servers and SQL Server instances. Before installing a SQL Server failover clustering instance, ensure the MSDTC service is created as a clustered resource in its own resource group with its own disk resource. In Windows Server 2003 and earlier clusters, it was common for the MSDTC resource to be configured as part of the quorum group. Certain applications, such as high-throughput BizTalk applications, make heavy use of the MSDTC resource. Insulating MSDTC from the quorum helps to prevent cluster failures due to quorum disk timeouts. Windows Server 2008 allows multiple clustered DTC instances to be installed. In such clusters, consider installing a clustered DTC instance for each SQL Server instance that requires DTC services. Such a configuration enhances the load balancing of DTC traffic. Like nonclustered SQL Servers, a clustered SQL Server node shouldn t be a domain controller, or run any other server applications such as Microsoft Exchange.

Fig 7-4

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