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  1. Esti
    Esti10-19-2014

    came upon this and thought it was a good rule of thumb:

    percentage of availability = ((total elapsed time – sum of downtime)/total elapsed time)

    Number of 9s Availability Downtime per year

    98.9% 3 days, 18 hours, 20 minutes
    99.0% 3 days, 15 hours, 36 minutes
    99.9% 8 hours, 46 minutes
    99.99% 53 minutes
    99.999% 5 minutes

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