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.
Questioning 99.999% uptime: When are four nines enough?
In some super-important industries, 99.999% upt...(SearchDataCenter.com)
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