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Exam E20-393 topic 1 question 178 discussion

Actual exam question from Dell's E20-393
Question #: 178
Topic #: 1
[All E20-393 Questions]

A company needs to expand their dynamic pool by 5 TB. The current dynamic pool consists of sixty-three 3.8 TB SSD that are configured for RAID5 4+1.
What is the minimum number of drives needed for the pool expansion?

  • A. 1
  • B. 6
  • C. 7
  • D. 8
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Suggested Answer: A 🗳️
by qgh at May 28, 2020, 12:38 a.m.

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eddb
3 years, 11 months ago
Correct Answer B https://www.delltechnologies.com/en-us/documentation/unity-family/unity-p-pool-config/06-unity-pool-br-understanding-raid.htm
upvoted 2 times
SweetyPotato
3 years, 10 months ago
RAID Level | Number of drives | RAID Width ======================================================= RAID 5 | 6 to 9 | 4+1 | 10 to 13 | 8+1 | 14 or more | 12+1 =======================================================
upvoted 1 times
SweetyPotato
3 years, 10 months ago
should be B.
upvoted 1 times
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Mr_K
4 years ago
Is it not "B" As an example, the smallest RAID 5 stripe width the system supports is a 4+1. The smallest dynamic pool created with the RAID 5 4+1 configuration is 6 drives. The minimum drive count includes the number of drives specified in the stripe width, plus an extra drive to satisfy the spare space requirements
upvoted 2 times
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qgh
4 years, 7 months ago
Correct answer is C, DPG max is 64, RAID5 (4+1) need 6 drives to start new DPG, thus 1+6=7
upvoted 4 times
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