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Level of Availability

The level of availability can be expressed by the Nine Rule :

Percentage of availability Percentage of unavailability Annual unavailability Weekly unavailability
98% 2% 7.3 days 3 hours, 22 minutes
99% 1% 3.65 days 1 hour, 41 minutes
99.8% 0.2% 7 hours, 13 minutes 20 minutes, 10 secondes
99.9% 0.1% 8 hours, 45 minutes 10 minutes, 5 secondes
99.99% 0.01% 52.5 minutes 1 minute
99.999% 0.001% 5.25 minutes 6 secondes
99,9999% 0,0001% 31,5 seconds 0,6 secondes

The effect of service unavailability time can be more or less important according to the business and the day this happens. In most environments, the transition from a system availability of 99% to 99.9% increases the costs by 5 to 10 times.


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