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Uptime vs Downtime

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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 Downtime

Uptime 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
Uptime vs Downtime
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.

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Calculation Notes

Based on a common year of 8760 hours.