Say it daily 18: The 5 9s
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The Holy Grail of server availability is the so called 5 9’s. This translates into a 99.999% availability per year. Here follows a table of how much every nine is worth…

Availability Associated Downtime per Year
99% 87 hours and 36 minutes
99.5% 43 hours and 48 minutes
99.95% 4 hours and 23 minutes
99.99% 53 minutes
99.999% 5 minutes

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