5 nines is 5 minutes of downtime per year. 4 nines is 52 minutes of downtime per year. See: http://en.wikipedia.org/wiki/High_availability#Percentage_calcula

5 nines is 5 minutes of downtime per year. 4 nines is 52 minutes of downtime per year. See: http://en.wikipedia.org/wiki/High_availability#Percentage_calculation http://en.wikipedia.org/wiki/High_availability#Percentage_ca... for a handy chart and follow along with any of your favorite *aaS providers!