When a service is described as “three 9s available”, what is the approximate amount of downtime allowed per week?
A. 10 seconds
B. 10 minutes
C. 10 hours
D. 10 days
5 Comments on “When a service is described as "three 9s available", what is the approximate amount of downtime allo”
Larssays:
B. 10 minutes
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kerkaelsays:
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.
B. 10 minutes
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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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B
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This is wrong
https://www.intermedia.net/blog/2014/01/28/99-999-uptime-vs-99-9-uptime-the-difference-two-extra-nines-makes/
3 nines = 99.9% of 365 days
therefore 10 hours is the most correct answers
you all mistaken 3 nines as .999 which is NOT what 3 nines is (99.9)
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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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