ITPEC IP October 2020 Question 14
ITPEC IP October 2020 — Question 14 of 100
MTBF divided by MTBF plus MTTR is availability: the proportion of total time that the system is operating. One typical cycle consists of an average operating period, MTBF, followed by an average repair period, MTTR, so uptime divided by the whole cycle gives MTBF / (MTBF + MTTR).
Answer (c)
Why not others:
- average operating time until failure is MTBF alone
- average recovery time is MTTR alone
- downtime proportion is MTTR / (MTBF + MTTR)
Key rule: Availability = uptime ÷ total time; increase it by increasing MTBF or decreasing MTTR.
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