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After you have a set of computers that represent each of the various types of computers in your organization, connect them to a private network . You will also need to connect test versions of your update infrastructure computers . For example, if you plan to deploy updates by using WSUS, connect a WSUS server to the lab network . Load every application that users will use onto the lab computers and develop a procedure to test the functionality of each application . For example, to test the functionality of Internet Explorer, you can visit both the Microsoft Web site and an intranet Web site . Later, when testing updates, you will repeat this test . If one of the applications fails the test, the update you are currently testing might have caused a problem .

balancing by ordering and/or selecting members of a replica set to fulfill a client request for data on the replica set. In addition, DFS achieves high availability by routing requests to the working member or members of a replica set when a member becomes unavailable. The components that make up the DFS architecture are shown in Figure 12-35. The serverside implementation of DFS consists of a Windows service (\%SystemRoot%\System32 \Dfssvc.exe) and a device driver (\%SystemRoot%\System32\Drivers\Dfs.sys). The DFS service is responsible for exporting DFS topology-management interfaces and maintaining the DFS topology in either the registry (on non Active Directory systems) or Active Directory. The DFS driver performs topology lookups when it receives a client request so that it can direct the client to the system where the file it is requesting resides.

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In addition to testing your implementation of an update, conducting a pilot deployment provides an opportunity to test your deployment plan and the deployment processes . It helps you to determine how much time is required to install the update as well as the personnel and tools needed to do so . It also provides an opportunity to train support staff and to gauge user reaction to the update process . For example, if a particular update takes an hour for a dial-up user to download, you might have to identify an alternative method for delivering the update to the user .

Besides testing the update yourself, subscribe to mailing lists and visit newsgroups frequented by your peers . People tend to report problems with updates to these forums before an official announcement is made by Microsoft . If you do discover a problem, report it to Microsoft . Historically, Microsoft has fixed and re-released security updates that have caused serious problems . On the other hand, Microsoft support might be able to suggest an alternative method for reducing or eliminating the vulnerability .

After you are satisfied that you have sufficiently tested an update, you can deploy it to your production environment . During the installation process, be sure to have sufficient support staff to handle problems that might arise . Have a method in place to monitor the progress of the updates, and have an engineer ready to resolve any problems that occur in the update deployment mechanism . Notify network staff that an update deployment is taking place so that they are aware of the cause of the increased network utilization .

Despite following proper planning and testing procedures, problems can arise when you deploy an update to production computers . Before you deploy updates, have a plan in place to roll back updates from one, many, or all of the target computers . The main steps for the rollback and redeployment of updates are as follows:

1. 2.

Stop the current deployment . Identify any steps necessary for deactivating release mechanisms used in your environment . Identify and resolve any update deployment issues . Determine what is causing an update deployment to fail . The order in which updates are applied, the release mechanism used, and flaws in the update itself are all possible causes for a failed deployment . Uninstall updates if necessary . Updates that introduce instabilities to your production environment should be removed if possible . For instructions, refer to the section titled How to Remove Updates earlier in this chapter . Reactivate release mechanisms . After resolving update issues, reactivate the appropriate release mechanism to redeploy updates . Security bulletins issued by Microsoft will always indicate whether an update can be uninstalled . Because reverting computers to a previous state is not always possible, pay close attention to this detail before deploying an update that cannot be uninstalled .

When a simple uninstall process is not available for a security update, ensure that the necessary provisions are in place for reverting your critical computers back to their original states in the unlikely event that a security update deployment causes a computer to fail . These provisions might include having spare computers and data backup mechanisms in place so that a failed computer can be rebuilt quickly .

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