A software has been observed to crash 20 times during the year 2017 and each time it took 2 minutes to restart. What is the approximate availability of the software?
Pick an option to check yourself, or open the answer below.
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Correct answer: D. 99.9924%
Explanation
Total downtime in the year = 20 crashes × 2 minutes = 40 minutes. Total time in a year = 365 × 24 × 60 = 5,25,600 minutes, so the uptime = 5,25,600 − 40 = 5,25,560 minutes. Availability = uptime / total time = 5,25,560 / 5,25,600 = 0.9999239, that is 99.9924%. Because the downtime is tiny compared with a whole year, only the option very close to 100% can be right, which is option (4).More Software Engineering questions
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