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When a service is described as "three 9s available", what is the approximate amount of downtime allo

When a service is described as “three 9s available”, what is the approximate amount of downtime allowed per week?

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A.
10 seconds

B.
10 minutes

C.
10 hours

D.
10 days

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5 Comments on “When a service is described as "three 9s available", what is the approximate amount of downtime allo

  1. kerkael says:

    999 available means 1/1000 unavailability
    Over 1 week of 168 hours, that’s 168*60/1000 minutes, or 1,68*6.
    This makes a little more than 10 minutes over a full week.




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  2. Ankit Saxena says:

    Correct Answer is B : 10 minutes

    Explanation-
    three 9’s means 99.9% of 1 year = 8.76 hours

    1 year = 8.76 hour // 8.76*60= 525.6 minutes
    1 week = 525.6/48 = 10.86 ~ 10 minutes [ 1 year ~ 48 weeks ]




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