Operating System | RAID concept The reliability of a hard-disk drive is typicall

Question

Operating System | RAID concept

The reliability of a hard-disk drive is typically described in terms of a quantity- called mean time between failures (MTBF). Although this quantity is called a "time," the MTBF actually is measured in drive-hours per failure. If a system contains 1,000,000 drives, each of which has a 100,000 hour MTBF, which of the following best describes how often a drive failure will occur in that disk farm: once per thousand years, once per century, once per decade, once per year, once per month, once per week, once per day, once per hour, once per minute, or once per second?

Explanation / Answer

100,000 drive-hours per failure / 1,000,000 drives = 1 hour per failure or 0.04 days per failure. 0.000109 per year.

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.