UGC NET JULY 2018 (Computer Science And Applications Paper-II) (Question 14)
Q14. 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%
Answer : (4). 99.9924%
Reason : We are given with Mean Time To Repair (MTTR) is a basic measure of the maintainability of repairable items. It represents the average time required to repair a failed component or device.
i.e. MTTR = 2 mins (2 mins to restart after crash)
Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system, during normal system operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system.
MTBF = Total Running Time in Year = 365 x 24 x 60
Number of Times System Crash in a Year 20
MTFB = 26230
Now we need to find Availability of Software in a Year = MTBF = 26230
MTBF + MTTR 26230 + 2
= 0.9999239 = 0.9999239 x 100 %
= 99.99234 %
Q14. 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%
Answer : (4). 99.9924%
Reason : We are given with Mean Time To Repair (MTTR) is a basic measure of the maintainability of repairable items. It represents the average time required to repair a failed component or device.
i.e. MTTR = 2 mins (2 mins to restart after crash)
Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system, during normal system operation. MTBF can be calculated as the arithmetic mean (average) time between failures of a system.
MTBF = Total Running Time in Year = 365 x 24 x 60
Number of Times System Crash in a Year 20
MTFB = 26230
Now we need to find Availability of Software in a Year = MTBF = 26230
MTBF + MTTR 26230 + 2
= 0.9999239 = 0.9999239 x 100 %
= 99.99234 %
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