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Uptime is the amount of time that a service has remained operational.Downtime is the amount of time that a service has experienced operational disruptions that render its primary functionalities unavailable.
Uptime vs DowntimeUptime and downtime are two ways to measure the availability of a service or technology. Uptime as a percentage of time is the most common measurement of availability. It is common for a service to target availability of 99.99% or higher as follows.Uptime | Downtime (monthly) | Known As | 99% | 7.3 hours | Two Nines | 99.9% | 43.8 minutes | Three Nines | 99.99% | 4.38 minutes | Four Nines | 99.999% | 26.28 seconds | Five Nines | 99.9999% | 2.628 seconds | Six Nines |
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| Uptime | Downtime | Definition | The percentage of time that a service remains operational over a month or year. | The amount of time that a service experiences outages of primary functionalities in a month or year. |
IT Skills
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Calculation NotesBased on a common year of 8760 hours.
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