No, eight nines is 316 milliseconds of downtime per year. 30 seconds of downtime a year is six nines. (I spent a long time working on high availability at Sun,

No, eight nines is 316 milliseconds of downtime per year. 30 seconds of downtime a year is six nines. (I spent a long time working on high availability at Sun, so the numbers immediately looked wrong.) https://en.wikipedia.org/wiki/High_availability#Percentage_calculation https://en.wikipedia.org/wiki/High_availability#Percentage_c...