Microsoft® Windows® 2000 Scripting Guide
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Many of the important operations that take place on a computer (especially on servers) run as services. This makes it imperative that you carefully monitor the services running on the computers in your network. Many services (such as DNS and DHCP) are so critical that a failure on a single server could adversely affect hundreds or even thousands of users, preventing them from logging on to the network or accessing network-based resources.
In general, there are three forms of service monitoring:
The exact definition of availability depends on the expectations for each service. If a database service must be available to users from 8:00 A.M. to 6:00 P.M. Monday through Friday, it can be considered completely available as long as the service is running during those times. If the service fails on a Saturday, or at 2:00 A.M. on Tuesday, this does not affect availability. It does, however, affect service reliability.
Reliability is calculated by dividing the time the service is functioning by the total number of days in a year. For example, a service that experiences a total downtime of 2 days during the course of a year is 99.5 percent reliable (363 days of availability divided by 365 days in a year).
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