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Performing a Complete System Restoration
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If you ve lost all the data on a disk (such as in the case of a failed, non-fault-tolerant drive), you ll need to start from scratch. The general steps required are time-consuming, but you may have no alternative. The first step is to replace any hardware that has failed. For example, you might need to replace a hard disk or network card that is no longer functioning. This step could be very difficult if you are unable to determine which component has failed. If uptime is very important, it is a good idea to keep a spare server available. As long as the failure is not related to disk devices, you can remove the hard disks from the failed machine and plug them into another one with a similar configuration. A less costly alternative might be to enter into a service agreement with your hardware vendor or a third party who can guarantee replacement hardware within a few hours. Once the hardware has been repaired or replaced, it s time to start recovering information. In 5, we ll look at various software and hardware devices that can be used to protect information. If you are using a third-party backup tool, you should follow the instructions included with that software. For example, certain types of backup software provide disaster recovery options. These features allow you to boot a minimal OS (using a CD-ROM or floppy disks) and begin a recovery operation immediately.
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If your software does not support this, you should start by reinstalling the OS. Although a complete reconfiguration is not necessary, you ll need to install the bare minimum to boot the system. This might include any special drivers required by your hardware. Next, you ll need to reinstall the drivers for your backup device, along with any third-party backup tools or utilities used. Following these steps, you ll be able to start a full restoration from the media using your backup software. Be sure to specify that all files should be replaced, including the existing Windows NT/2000 system Registry. Assuming that the restoration is successful, you will be able to reboot the computer and be back in business!
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NOTE: Backing up and recovering Windows 2000 Active Directory requires special considerations based on your configuration. The process is fairly simple in environments that have only a few domain controllers, but it can be considerably more complex for larger or more distributed organizations. Be sure to plan adequately for restoring Active Directory to ensure that information is not lost due to system failures.
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Monitoring and optimizing performance is especially important when performing backups. Fortunately, the tools for performance monitoring have changed relatively little and are consistent between Windows NT 4 and Windows 2000. Based on your server configuration and business environment, optimization can enable you to perform tasks more quickly without having to purchase and manage additional servers and workstations. Windows NT includes several tools that can aid in the evaluation of performance. In this section, we ll cover the following: w s v Performance Monitor Task Manager Network Monitor
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Often, systems administrators will use the trial-and-error approach to performance optimization. For example, if something is not running as fast as an administrator thinks it should, the administrator will make one or more changes. If performance seems faster after a change, the setting is retained. Otherwise, it s back to square one. Although this method might work occasionally, the configuration changes may or may not have had a positive effect. For example, the changes could have a negative performance impact on other subsystems. Or, worse yet, the change could have no real effect, because the perceived improvement was due to a change in conditions. Holistic performance monitoring is based on carefully using a consistent methodology.
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To monitor performance, it is important that you first have a baseline of information. This baseline should be compiled over time and should be used for measuring any significant changes to your system. Keep in mind that it is always a good practice to make only one change at a time. This way, you ll be able to measure the effects of modifying a single parameter. Also, if performance decreases or other problems come up, you ll know what needs to be changed to return to the original configuration. Documenting performance values is just as important as making changes. A nagging question that may have occurred to you is, By measuring performance, am I not actually decreasing it The short answer is sometimes. In some cases, performance monitoring may present a significant drain on resources. For example, the Windows NT Performance Monitor application itself uses CPU time, memory, and display resources. On modern systems, however, the drain is often negligible. In other cases, it s worth the performance decrease to collect important information. Whether you are running Performance Monitor or not, Windows NT itself automatically keeps track of performance data for tuning itself. Therefore, it does not matter if you measure 100 different parameters or only 1. The impact of running Performance Monitor will also remain constant for most types of monitoring, so you need not worry about it as long as you re using the same tool to measure performance each time.
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