Discussion
Arrange these availability targets from least to most demanding.
1. 99.95%
2. 99%
3. 99.99%
4. 99.9%
Answer: B
Correct answer: 2 - 4 - 1 - 3
Ordering by the permitted downtime rather than by the percentage makes the steps clear: 99 per cent allows about 7 hours a month, 99.9 about 43 minutes, 99.95 about 22 minutes and 99.99 about 4 minutes. Each additional nine costs roughly ten times as much engineering as the one before it, which is why the target should be chosen from what the business actually needs.
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