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System Restore has sparse management options. You can change how much disk space it uses, which I've already covered, and you can even disable it altogether. There's only one good time to disable System Restore, and that's when you install Windows XP on sluggish computers. System Restore consumes a small slice of your computer's resources as it monitors the file system for changes, and disabling it can recover those resources. To disable System Restore, click Start, Control Panel, Performance And Maintenance, and then click System to open the System Properties dialog box. On the System Restore tab, select the Turn Off System Restore check box. But unless the computer is painfully slow, leave System Restore alone. Two policies are available to IT professionals for managing System Restore. The first is Turn off System Restore, which disables System Restore altogether. I know some administrators who haven't embraced System Restore yet, and they're disabling it in their organizations. Their concern is the amount of disk space it uses and the small performance penalty for using it; both are negligible in my opinion. If you don't want users to be able to configure System Restore, enable the Turn off Configurationpolicy, which locks the user interface so users can't change System Restore's configuration. Users can still create their own restore points, however. Both of these policies are per computer administrative settings (Computer Configuration\Administrative Templates) in \System\System Restore. System Restore has a few other settings for which it doesn't provide a user interface or policy. These are mostly settings in the registry that control System Restore's schedule. You can build your own administrative template for these, however, which you learn about in 6, "Using Registry Based Policy." 6 also shows you how to enable policies.

Add named calculations to the DimDate table as shown in Table 5-1.

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Figure 2-3

The most common measurement of availability is expressed as a number of 9s, which creates really nice buzzwords for a chief information officer (CIO), chief technical officer (CTO), or chief executive officer (CEO). However, it has very little actual basis in fact. Just because you aren t achieving five 9s of availability (99.999 percent) doesn t mean there is a problem. You could be dealing with an application that needs only 98.45 percent availability or one that needs 92.6 percent availability. The formula used to calculate availability is as follows, where A = Availability, F = Mean time between failures (MTBF), MR = Mean time to recognize, and R = Mean time to repair: A = (F (MR + R))/F The interesting thing about this formula is that you calculate availability based on fail ures and recovery. You do not have any control over failures they are simply going to happen and rarely provide any warning at all. However, you can influence the amount of time it takes to diagnose a problem, come up with a solution, and repair the system. You might be a bit puzzled at this point. This chapter is about high availability, and everyone knows that high availability is about keeping a system online. Unfortunately,

When planning a Group Policy application deployment, you must review your organization s software requirements and compare them to your AD DS organizational structure and your available Group Policy Objects (GPOs). With this information, you can determine how you want to deploy your applications. Then create a test environment to determine exactly how you want to assign or publish software to your users or computers.

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Describe remote-site VPN access configuration options Describe a site-to-site VPN Choose a VPN tunneling protocol Configure a remote-site network on ISA Server Configure a site-to-site VPN using IPSec tunnel mode Configure network and access rules for site-to-site VPNs Configure the remote-site VPN gateway server Troubleshoot site-to-site VPNs

Striped Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-34

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If you do not want a Service help page to appear when a user browses to the location where your Web service resides, you can disable the documentation entirely by add ing the following section to your Web.config file:

A. The user does not have Terminal Server access enabled in her user account properties. B. The user does not have dial-in permission enabled in her user account properties. C. The user does not have a computer account in the domain for her remote computer. D. The user is not supplying the correct credentials when dialing in.

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