You are speaking to your CIO, and she has instructed you to ensure that the network is "five nines" in percentage of availability. What is the total yearly downtime that this allows?

Question

Group of answer choices

8.76 hours

3.65 days

5.26 minutes

31.5 seconds

Answer 1

"Five nines" availability refers to a system being operational 99.999% of the time. To calculate the total allowable yearly downtime:

1. Start with the total minutes in a year:

   • There are 525,600 minutes in a year (60 minutes/hour * 24 hours/day * 365 days/year).

2. Calculate the allowable downtime:

   • Availability = 99.999%
   • Downtime = 100% - 99.999% = 0.001%
   • Allowable downtime in minutes = 525,600 minutes * 0.00001 = 5.256 minutes.

Therefore, the total yearly downtime that "five nines" availability allows is approximately 5.26 minutes.

So the correct choice from your options is 5.26 minutes.