Definition

uptime and downtime

Part of the Computing fundamentals glossary:

Uptime is a computer industry term for the time during which a computer is operational. Downtime is the time when it isn't operational. Uptime is sometimes measured in terms of a percentile. For example, one standard for uptime that is sometimes discussed is a goal called five 9s - that is, a computer that is operational 99.999 percent of the time.

Next Steps

Questioning 99.999% uptime: When are four nines enough?
In some super-important industries, 99.999% upt...
(SearchDataCenter.com)
How can I get the best possible uptime of my desktop?
(SearchWinIT.com)

This was last updated in September 2005

Posted by: Margaret Rouse

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Dig Deeper

Questioning 99.999% uptime: When are four nines enough?

In some super-important industries, 99.999% uptime should be the goal. But most companies can tolerate a little more downtime. (SearchDataCenter.com)
How can I get the best possible uptime of my desktop?

(SearchWinIT.com)
Stratus Technologies launches new partner program

The new Stratus4Uptime program focuses on helping VARs with uptime products and includes discounts, training, marketing and technical support. (SearchITChannel.com)

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