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2016-05-26

high availability table - just what those nines stand for ...

Availability % Downtime per year Downtime per month Downtime per week Downtime per day
90% ("one nine") 36.5 days 72 hours 16.8 hours 2.4 hours
99% ("two nines") 3.65 days 7.20 hours 1.68 hours 14.4 minutes
99.9% ("three nines") 8.76 hours 43.8 minutes 10.1 minutes 1.44 minutes
99.99% ("four nines") 52.56 minutes 4.38 minutes 1.01 minutes 8.66 seconds
99.999% ("five nines") 5.26 minutes 25.9 seconds 6.05 seconds 864.3 milliseconds
99.9999% ("six nines") 31.5 seconds 2.59 seconds 604.8 milliseconds 86.4 milliseconds
99.99999% ("seven nines") 3.15 seconds 262.97 milliseconds 60.48 milliseconds 8.64 milliseconds
99.999999% ("eight nines") 315.569 milliseconds 26.297 milliseconds 6.048 milliseconds 0.864 milliseconds
99.9999999% ("nine nines") 31.5569 milliseconds 2.6297 milliseconds 0.6048 milliseconds 0.0864 milliseconds

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