• dhork@lemmy.world
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    6 months ago

    “Five Nines” typically refers to something that works 99.999% of the time, which still allows for 1 screw-up out of 100,000.

      • shalafi@lemmy.world
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        6 months ago

        I learned it working telecom. For example, if you wish to offer 911 service, your service has to be operational 99.999% of the time.

        It’s more casually used to mean a service or operation is insanely reliable.