For extended help on this tool, type the following at a command prompt:
It is important to note that the uptime and availability measurements reflect the local view of the operating system only. The "Total Uptime" measurement refers to the sum of all the time during the measured period where the operating system reported itself to be in normal operation. It does not reflect times when the server might be unavailable for other reasons, such at network outages.
It is also important to note that although the operating system is functioning normally, this does not mean that the server programs running on that server are operating normally. For instance, the operating system may be available, but a database running on that server may not be operating correctly.
Uptime depends on the Event log for the data it uses to calculate availability. The tool is not able to make calculations prior to the beginning of the Event log. If the Event log is cleared, no calculations are possible. Certain settings can be disabled limiting the accuracy of this tool. For example, writing an event when the system stops responding and displays a blue screen error message or disabling Dr. Watson for program error messages. Please see the following article in the Microsoft Knowledge Base for information on blue screen error messages:
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Article ID: 232243 - Last Review: Aug 20, 2012 - Revision: 1