Aug 29, 2010

What is five nine's availability ?

Very commonly we come across the figure 99.999 % uptime or availabilty. But what actually does it means in practical terms. Here is the explanation :
60 seconds * 60 minutes * 24 hours * 365 = 31,536,000 seconds.in a year
99.999/100*31,536,000 = 31535684.64 seconds
Now : 31,536,000 - 31,536,000 = 315.36 seconds of downtime or approximately 6 minutes of downtime in a year.

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