Exam 220-1001 topic 1 question 130 discussion

Actual exam question from CompTIA's 220-1001

Question #: 130
Topic #: 1

A technician is configuring a new web server and must have over 10TB of fault-tolerant storage, while minimizing the number of failure points. The applications on the server also require the highest performance available. Which of the following configurations would the technician MOST likely select?

A. RAID 0 with 15000rpm 15TB drives
B. RAID 1 with 10000rpm 8TB drives
C. RAID 5 with 7200rpm 5TB drives
D. RAID 10 with 5400rpm 6TB drives

Show Suggested Answer

Suggested Answer: D 🗳️

by Khali at Nov. 24, 2019, 8:53 p.m.

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gcarmensb17

Highly Voted 5 years, 7 months ago

Hi! I recommend to check this RAID calculator http://www.raid-calculator.com/default.aspx It helped me a lot to understand this question. Remember RAID 0 needs a minimum of 2 drives, RAID 1 needs a minimum of 2 drives, RAID 5 needs a minimum of 3 drives, and RAID 10 needs a minimum of 4 drives. RAID 0 is not the answer because it doesn't provide fault tolerance. RAID 1 provides fault tolerance but only 8TB of capacity. RAID 5 provides fault tolerance and a capacity of 10TB. RAID 10 provides fault tolerance and a capacity of 12 TB. Because it needs over 10TB fault tolerant storage, I think that option D is the right answer. Let me know your thoughts!

upvoted 38 times

Motive

5 years, 6 months ago

RAID 10 will also provide the highest performance, which is a requirement

upvoted 13 times

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Suraj97

Most Recent 3 years ago

How raid 10 has 12 tb storage... doesn't the question say only 6 tb I'm confused

upvoted 1 times

huyhoang880

2 years, 9 months ago

raid 10 is basically raid 1 combined with raid 0. so it needs 4 drives, 2 for data and 2 for backup, which makes 6+6=12

upvoted 1 times

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Cjones10

4 years, 2 months ago

You can eliminate "A" after reading to fault-tolerant storage, because RAID 0 is for performance only, then you can eliminate "B" after reading that it requires the highest performance available, because RAID 1 is for fault-tolerance. It would be between "C" and "D", but I would say "D", because RAID 10 is RAID 1+0 or RAID 0+1.

upvoted 2 times

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TechTroll

5 years, 3 months ago

Yea it makes sense I guess don't pay attention to the RPM speeds. If you type it into the website provided by @gcarmensb17 you can see it says 4x read and 2x write speeds versus 2x write from the RAID 5. Still a bad question.

upvoted 2 times

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Khali

5 years, 8 months ago

I am confused on how is D the correct answer.

upvoted 1 times

klabarrie473

4 years, 11 months ago

Raid 1+0 has high fault tolerance because it will function with at least 2 of the 4 drive minimum(one from each pair of mirrors) secondly the total amount of usable drive space is 12TB...1 drive in each pair of mirrors will be an exact duplicate of the other drive in the pair...so you lose 6 TB on each side.

upvoted 5 times

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