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To enable a scalable shared database, it must be mounted on a read-only volume and accessed over a storage area network (SAN). The availability of the SAN protocol is new with the Enterprise Edition of SQL Server 2005. It allows you to cluster servers together and deliver high availability to your database applications. Once the volume is mounted and the database built, you can attach the database to an instance of SQL Server. This is when it becomes available as a scalable shared database. It can then be accessed by clients using reporting servers.

A standard cluster, as shown in Figure 8-1, has a single quorum database stored on the shared array. The quorum drive is accessible by only one node within the cluster at any time. All other nodes in the cluster cannot access the drive. In the event of a fail ure, another node takes ownership of the disk resource containing the quorum data base and then continues cluster operations.

Counter and trace log files can grow rapidly and become very large, especially if you specify a short sample interval. Take care to place such files on a disk with sufficient free space; otherwise, the files could cause the very problem they are meant to detect.

A majority node set cluster is available only in Windows Server 2003. The main differ ence with a majority node set is that a copy of the quorum database is stored locally on each node in the cluster.

All reporting servers should be running under the same operating system and service pack. If upgrades or updates are needed, make sure they are applied to all servers.

8

Even though the database is read-only, you will need to periodically refresh the data within the database. To update the database, you will need to detach all instances and attach only one instance in read/write mode. The best way to do this is to alternate the update cycles between two different volumes. While the first volume is being updated, the second one can be reattached to the production server to prevent application downtime.

The location of the quorum is %SystemRoot%\Cluster\QoN.%ResourceGUID%$\%ResourceGUID%$ \MSCS. A share is created on each node that is named \\%NodeName%\%ResourceGUID%$. You should not modify this directory or change the permissions on this directory or share in any way.

You can evaluate the pressure on a single CPU or on the CPU resource on a symmetric microprocessor (SMP) server. You can also set alerts on CPU usage, but this is, arguably, of less value than setting alerts on disk usage. CPU usage is typically 100 percent when a service or an application starts, and a problem exists only if usage remains at this level for a significant amount time or if a high average usage is detected. You assess pressure on the processor resource by monitoring the Processor and System objects. The counters you typically use for this purpose are the following ones:

A majority node set gets its name because a majority of the nodes have to be online for the cluster to be online. For this reason, you create majority node set clusters only when you have three or more nodes configured in the cluster. Table 8-3 shows a com parison of how many nodes can be offline with the cluster still operational for a stan dard cluster and a majority node set cluster.