CAS-003 Question #505: Real Exam Question with Answer & Explanation

The correct answer is C: MTBF. MTBF (Mean Time Between Failures) measures the average time a component operates before failing. For determining how many spare hard drives to keep on hand, MTBF is the most actionable metric - it tells the administrator how frequently drives are statistically expected to fail, a

Question

Following a recent outage, a systems administrator is conducting a study to determine a suitable bench stock on server hard drives. Which of the following metrics is MOST valuable to the administrator in determining how many hard drives to keep-on hand?

Options

ATTR
BALE
CMTBF
DSLE
ERPO

Explanation

MTBF (Mean Time Between Failures) measures the average time a component operates before failing. For determining how many spare hard drives to keep on hand, MTBF is the most actionable metric - it tells the administrator how frequently drives are statistically expected to fail, allowing them to calculate a rational quantity of spares. TTR (Time to Repair) measures how long repairs take. ALE (Annual Loss Expectancy) and SLE (Single Loss Expectancy) are financial risk metrics. RPO (Recovery Point Objective) defines acceptable data loss thresholds - none of these directly inform spare-parts inventory levels the way MTBF does.

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