UGC-NET | UGC NET CS 2016 Aug – III | Question 43

An Operating System (OS) crashes on the average once in 30 days, that is, the Mean Time Between Failures (MTBF) = 30 days. When this happens, it takes 10 minutes to recover the OS, that is, the Mean Time To Repair (MTTR) = 10 minutes. The availability of the OS with these reliability figures is approximately :
(A) 96.97%
(B) 97.97%
(C) 99.009%
(D) 99.97%


Answer: (D)

Explanation: System crashes once in 30 days and need 10 minutes to get repaired.
Either convert 30 days into minute or 10 minute into days
30 days = 30 ∗ 24 ∗ 60 minute
fraction of time system is not available = (10 / (30 ∗ 24 ∗ 60 )) ∗ 100 = 0.023%
Availability = 100 – 0.023 = 99.97%
So, option (D) is correct.

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