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Exam DEA-1TT4 topic 1 question 112 discussion

Actual exam question from Dell's DEA-1TT4
Question #: 112
Topic #: 1
[All DEA-1TT4 Questions]

A company plans to deploy a new application in their environment. The new application requires 5 TB of storage space. During peak workloads, the application is expected to generate 3000 IOPS with a typical I/O size of 3 KB. The capacity of each available disk drive is 750 GB. In addition, the maximum number of IOPS a drive can perform at with a 70% utilization is 90 IOPS.
What is the minimum number of disk drives needed to meet the application's capacity and performance requirements for a RAID 0 configuration?

  • A. 7
  • B. 34
  • C. 50
  • D. 40
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
Reference:
http://www.raid-calculator.com/default.aspx
by madmax67 at Oct. 6, 2020, 8:43 a.m.

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DragonTarzan
Highly Voted 3 years, 11 months ago
3000: 90 =33.333333 34 disks
upvoted 19 times
Kate321
3 years, 9 months ago
Agree, the required IOPs are 3000
upvoted 4 times
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madmax67
Highly Voted 4 years, 3 months ago
Harddisks can do 90 IOPS at 70% each (which is the recommended workload percentage to calculate with). Required by application is 4500 IOPS. So 4500 / 90 = 50 HDDs. So the answer could be C. 50. By adding a 25% risk buffer, the calculation result is 62.5 disks, so D. 70 maybe a correct answer, too.
upvoted 6 times
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gamalaa
Most Recent 2 years, 2 months ago
Selected Answer: B
3000 / 90 =33.333333 Should be 34 disks
upvoted 1 times
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kami2024
3 years ago
I assume that the number 7 should be 70. So then A would be correct
upvoted 1 times
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ByoungSoo_Yoon
3 years, 4 months ago
3000 : 90 = 33.3 -> 34 * 0.25 ( should considering 25% risk buffer) +8 41.25 = 40
upvoted 1 times
ByoungSoo_Yoon
3 years, 4 months ago
answer is D
upvoted 1 times
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gamalaa
2 years, 2 months ago
The disks aren't running at 100% as the question says the IOPS per disk are worked out at 70%
upvoted 1 times
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atidd
4 years, 3 months ago
minimum should be 50.
upvoted 4 times
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