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A software system crashed 20 times in the year 2017 and for each crash, it took 2 minutes to restart. Approximately, what was the software availability in that year?

  1. 96.9924%
  2. 97.9924%
  3. 98.9924%
  4. 99.9924%
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3 Answers

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Software availability is the probability that a program is operating at a given point in time

Given time period 365 days  each day has 1440 minutes

so total time in minutes =365x1440=525600

Non  working time =20x2 =40 minutes (20 times failed each time it took 2 min to restart)

Software availability = 525560 / 525600 = .999924 or 99.9924 %

Hence option 4 is right ans
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I think 4 is the answer

Since S/W crashed 20 times and each crash take 2 min

so waste time in crash=20*2=40 min

Now total time in year in min=365*24*60

so % crash time in that year=(40/365*24*60)*100

so availability time that year = 1-(40/365*24*60)*100

                                             =99.9924%
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Option D. 99.9924%

Availability =  $\frac{MTBF}{MTBF + MTTR}$ 
MTBF = Mean time between failure
MTTR = Mean time to repair

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