CV0-003 Question #109: Real Exam Question with Answer & Explanation

The correct answer is B: Proactively replace components before they fail. MTBF (Mean Time Between Failures) is a reliability metric that predicts average component lifespan before failure, and the best practice is to use that prediction to proactively replace components before an unplanned outage occurs.

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Question

Which of the following is a best practice used in relation to MTBF?

Options

ADetermine backup schedule based on uptime requirements
BProactively replace components before they fail
CDetermine downtime to perform a system recovery
DReactively replace components after failure

Explanation

MTBF (Mean Time Between Failures) is a reliability metric that predicts average component lifespan before failure, and the best practice is to use that prediction to proactively replace components before an unplanned outage occurs.

Common mistakes.

A. Backup schedules are driven by RPO (Recovery Point Objective), not by MTBF, which measures time between hardware failures rather than data recovery windows.
C. Determining downtime for system recovery relates to MTTR (Mean Time To Recovery), a separate metric that measures restoration time after failure, not the interval between failures.
D. Reactively replacing components after failure ignores the predictive value of MTBF entirely and results in the avoidable unplanned downtime that MTBF analysis is designed to prevent.

Concept tested. MTBF-driven proactive component replacement strategy

Reference. https://learn.microsoft.com/en-us/azure/well-architected/reliability/metrics

Topics

#MTBF#proactive maintenance#component replacement#availability

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