Among the other enhancements in Windows Server 2008, work was done to improve overall system reliability and performance. For example, to view processes in previous versions of Windows Server, you had two basic tools, both of which were virtually unchanged from release to release—the Task Manager and the Performance Monitor. In Windows Server 2008, these tools have been combined into a single interface, called the Performance Diagnostics Console (which is also integrated into the aforementioned Server Manager), to make it easier to view statistics and alerts about how well your machine is handling its duties.
The Resource View is a simpler, but more powerful, view of how certain processes and services, among other metrics, are using the available resources on your machine. The Reliability Monitor shows a detailed view of exactly what events are occurring on a regular or intermittent basis to degrade the stability of your server. For example, you can see problems and degradations based on software installation activity, application failures, hardware missteps, Windows failures, and other, uncategorized problems. The Reliability Monitor generates a "stability index," which is a painfully arbitrary number supposedly representing, on a scale of 1 to 10, how pristine your system is.
*.* Source of Information : O'Reilly Windows Server 2008: The Definitive Guide
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