A system has uptime and has a mean‐ 1 day time‐between‐failure of . How fast does the system has to repair itself in order to reach this availability goal?
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Correct answer: A. ~9 Seconds
Explanation
Availability = MTBF/(MTBF + MTTR). With 99.99% and MTBF = 86,400 s: MTTR ≈ 86,400 × 0.0001 ≈ 8.6 s, about 9 seconds.
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