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Both the private and public networks connecting the nodes have to appear as a single, nonrouted LAN that must guarantee a 500-millisecond or less round-trip response time. If your latency is greater than that, it does not adhere to the guidelines. You can use behind-thescenes technology such as virtual LANs (VLANs), but the cluster interconnect itself must appear as a standard LAN to the servers. Mirroring your disks is a key component of a geographically dispersed cluster. This means you need a copy of your shared disk subsystem in the other location; the split nodes over the two locations do not share the same disk subsystem. The quorum must be mirrored synchronously; it cannot be done asynchronously. The single disk semantics must be maintained. You can mirror your SQL Server disks either synchronously or asynchronously, but obviously it is better that they are mirrored synchronously. Keep in mind that when things are mirrored at the disk level, they are done at the block or page. There is no concept of transaction as there is within SQL Server itself. One of the reasons to employ a certified geographically dispersed cluster is that the vendor has tested the solution with programs such as SQL Server and Exchange and most likely has a specific way of configuring for that application. With SQL Server, you must absolutely guarantee that there will be no torn pages written to the disk. A torn page is when the bits written to the disk are in the wrong state at the disk level and SQL Server detects the abnormality. A torn page can, and usually does, mean data loss. Qualified solutions should be able to prevent torn pages.

Once you ve created a test environment that provides a good representation of your production network, you should use it to test any new software installations or security patches before deploying them to your production network. This way, you can minimize the impact of any upgrades or changes by weeding out any errors or problems before they disrupt your users ability to access the resources that they need. By combining stringent testing with a well-thought-out disaster recovery plan, you ll actually be able to leave for the occasional four-day weekend without worrying that your network is going to fall to pieces while you re gone. So leave your pager at home and enjoy your vacation next time!

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Use the Microsoft Knowledge Base article 280743, Windows Clustering and Geographically Separate Sites, (http://support.microsoft.com/kb/280743) as a reference when dealing with your vendor. Never implement a solution that does not appear in the Windows Server Catalog as a geographically dispersed cluster. Although you might have the right technology, such as mirroring disks between sites, already configured, this does not mean what you have will work in a clustered scenario.

Summary

Summary

Time to have a look at our example. Create a Visual Studio 2005 C# Class Library project (found under the Windows node), call it ImageManipulation, and rename the class within the project to ImageManipulation. We also include the partial keyword in the class definition in case we want to add further methods to the class in different source files. using using using using using using System; System.Data; System.Data.SqlClient; System.Data.SqlTypes; System.IO; Microsoft.SqlServer.Server;

It is important to understand what you are implementing before you actually configure clusters. Microsoft s server cluster serves as the base for SQL Server s failover clustering feature, and both are designed from an availability standpoint. Once you do understand, there is a lot of planning and prework to do to ensure that the failover cluster is configured properly. Once you have done your planning, you can move onto the implementation phase for your Windows server cluster.

nce you understand what clustering is, how it works, its potential benefits, and the prerequisites needed, and you have decided to use it, you can progress to the installation phase. It is extremely important from a SQL Server standpoint to get the Windows configuration correct; otherwise, you could potentially have an unstable SQL Server 2005.

While I m tempted to say that it s never too late to start creating a disaster recovery plan, I m forced to admit that there actually is a time when that s not the case this is, of course, about five minutes after you realize that you need one and don t have one Because this critical component of administering an Active Directory network is often overlooked, this chapter focused on the key steps necessary in formulating a disaster recovery strategy and restoring a Windows 2000 or Windows Server 2003 server that has suffered hardware failure or data corruption This chapter covered the steps needed to back up and restore the Active Directory database in a variety of situations, using the built-in Windows Backup utility.

Although SQL Server 2005 can be clustered on either Windows 2000 Advanced Server or Windows 2000 Datacenter Server with Windows 2000 Service Pack 4, the next two chapters will focus on implementing and administering a server cluster with Windows Server 2003. Where applicable, I provide links for Windows 2000 Server information.

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