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A comment on Old Geek. Parent comment

Re:Old Geek by bandrami on Thursday September 15, 2016 @09:25AM (#12505893)
I've also seen people make the other mistake, though. I've had people screaming about 2 hours of downtime violating our 99.999% SLA, apparently not realizing the five nines means the thing can be down eight hours a year (an entire business day) and still be in spec.
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Re:Old Geek by entropy_ on Thursday September 15, 2016 @09:56AM (#12506120)
That's not true. 5 nines, ie 99.999% uptime means that the maximum downtime in a year is about 315 seconds:

60x60x24x365 x (1 - (99.999/100)) = 315.36

Wikipedia confirms: https://en.wikipedia.org/wiki/High_availability#Percentage_c...

So yes, 2hrs of downtime would most definitely violate the SLA. The 8 hours you refer to is the figure for 3 nines.

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Re:Old Geek by bandrami on Thursday September 15, 2016 @10:42AM (#12506525)
D'oh. It was three nines, thanks
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