How System Reliability Monitor works in Vista

by Sandra Rouane.
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In previous versions of Windows, the only way you could tell whether your system was stable was to think about how often in the recent past you were forced to reboot. If you couldn't remember the last time your system required a restart, you could assume that your system was stable. Not exactly a scientific assessment!

Windows Vista changes all that by introducing the Reliability Monitor. This new feature is part of the Windows Performance Diagnostic Console, which I discuss in more detail later. You load this Microsoft Management Console snap-in by pressing Windows Logo+R, typing perfmon.msc, and clicking OK. In the console window that appears, click Reliability Monitor.

Reliability monitor keeps track of the overall stability of your system, as well as reliability events, which are either changes to your system that could affect stability or occurrences that might indicate instability. Reliability events include the following:

  • Windows updates

  • Software installs and uninstalls

  • Device driver installs, updates, rollbacks, and uninstalls

  • Application hangs and crashes

  • Device drivers that fail to load or unload

  • Disk and memory failures

  • Windows failures, including boot failures, system crashes, and sleep failures

Reliability monitors graph these changes and generate a measure of system stability over time so that you can graphically see whether any changes affected system stability. The System Stability Chart shows the overall stability index. A score of 10 indicates a perfectly reliable system, and lower scores indicate decreasing reliability.

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