ITPEC IP October 2021 Question 59
ITPEC IP October 2021 — Question 59 of 100
Availability increases when MTBF becomes longer and MTTR becomes shorter. Availability can be expressed as MTBF divided by the sum of MTBF and MTTR. More time between failures increases operating time, while faster repair reduces downtime.
Answer (b)
Why not others:
- lengthening MTTR increases downtime and therefore reduces availability
- MTBF and MTTR measure different processes; changing one does not automatically force the other to change
Key rule: Improve availability by preventing failures, which raises MTBF, and restoring service faster, which lowers MTTR.
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