Question 8904 – ISRO CS 2020
December 26, 2023Queues-and-Stacks
December 26, 2023Software-Engineering
| Question 152 |
What is the availability of the software with following reliability figures
Mean Time Between Failures (MTBF) is 20 days
Mean Time To Repair (MTTR) is 20 hours
Mean Time Between Failures (MTBF) is 20 days
Mean Time To Repair (MTTR) is 20 hours
| 90%
| |
| 96%
| |
| 24%
| |
| 50%
|
Question 152 Explanation:
Mean time between failures is not the average time something works then fail.
It’s the average time between failures Mean time between failure(MTBF)s= total uptime / number of breakdowns Mean time to repair is the average time taken to repair something. Mean time to repair(MTTR)= total time down/number of breakdowns
Availability = Total uptime/(total uptime+total downtime)
= MTBF/(MTBF+MTTR)*100
= 20*24/(20*24 + 20) * 100
= 96 %
It’s the average time between failures Mean time between failure(MTBF)s= total uptime / number of breakdowns Mean time to repair is the average time taken to repair something. Mean time to repair(MTTR)= total time down/number of breakdowns
Availability = Total uptime/(total uptime+total downtime)
= MTBF/(MTBF+MTTR)*100
= 20*24/(20*24 + 20) * 100
= 96 %
Correct Answer: B
Question 152 Explanation:
Mean time between failures is not the average time something works then fail.
It’s the average time between failures Mean time between failure(MTBF)s= total uptime / number of breakdowns Mean time to repair is the average time taken to repair something. Mean time to repair(MTTR)= total time down/number of breakdowns
Availability = Total uptime/(total uptime+total downtime)
= MTBF/(MTBF+MTTR)*100
= 20*24/(20*24 + 20) * 100
= 96 %
It’s the average time between failures Mean time between failure(MTBF)s= total uptime / number of breakdowns Mean time to repair is the average time taken to repair something. Mean time to repair(MTTR)= total time down/number of breakdowns
Availability = Total uptime/(total uptime+total downtime)
= MTBF/(MTBF+MTTR)*100
= 20*24/(20*24 + 20) * 100
= 96 %