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Dell EMC D-UN-DY-23 Exam - Topic 2 Question 2 Discussion

A company needs to expand their dynamic pool by 10 TB. The current dynamic pool consists of 63 7.6 TB SSD drives that are configured for RAID 5 (12+1).What is the minimum number of drives needed for the pool expansion?
C) 13
A) 1
B) 15
D) 2

Dell EMC D-UN-DY-23 Exam - Topic 2 Question 2 Discussion

Actual exam question for Dell EMC's D-UN-DY-23 exam
Question #: 2
Topic #: 2
[All D-UN-DY-23 Questions]

A company needs to expand their dynamic pool by 10 TB. The current dynamic pool consists of 63 7.6 TB SSD drives that are configured for RAID 5 (12+1).

What is the minimum number of drives needed for the pool expansion?

Show Suggested Answer Hide Answer
Suggested Answer: C

To expand a dynamic pool, the number of drives added must be equal to or greater than the stripe width of the pool. The stripe width is the number of data drives plus the number of parity drives in a RAID group. In this case, the stripe width is 12 + 1 = 13.Therefore, the minimum number of drives needed for the pool expansion is 13.Reference: Dell EMC Unity: Dynamic Pools Technical White Paper1, page 8.


by Olive at Nov 26, 2023, 06:41 AM

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Leoma
8 months ago
I'm leaning towards 15 drives, just to be safe.
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Lamar
9 months ago
Definitely not just 1 drive, that's way too low.
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Lili
9 months ago
Wait, how do we even get 10 TB from RAID 5?
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Kassandra
9 months ago
I think 13 drives sounds about right for that expansion!
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Margart
9 months ago
The current drives are 7.6 TB each, so we need more than one.
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Nobuko
10 months ago
I feel like we might only need 2 drives since we're just expanding by 10 TB, but I need to double-check the RAID configuration impact on that.
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Nakita
10 months ago
I practiced a similar question where we had to calculate the number of drives needed for a RAID setup. I think it was around 13 drives, but I can't recall the exact details.
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Eve
10 months ago
I think we need to calculate the usable space after RAID overhead. If each drive is 7.6 TB, we might need more than just one drive for the expansion.
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Rutha
10 months ago
I remember something about RAID 5 needing extra drives for parity, but I'm not sure how that affects the total needed for expansion.
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Cassie
10 months ago
Easy peasy! The question states we need to expand by 10 TB, and the current pool is 63 drives at 7.6 TB each, configured in RAID 5. So the minimum number of new drives needed is 2.
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Claudio
10 months ago
I think I've got this. The current pool is 63 * 7.6 TB = 478.8 TB. We need to add 10 TB, so the new total would be 488.8 TB. Since each drive is 7.6 TB, and we need 1 parity drive, the minimum number of new drives would be 13.
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Marshall
10 months ago
I'm a bit confused on the RAID 5 part. Does that mean we need an extra drive for parity? I'll have to review my RAID knowledge to solve this one.
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Marge
10 months ago
Okay, let me break this down step-by-step. The current pool has 63 drives, each 7.6 TB, in a RAID 5 (12+1) configuration. We need to expand by 10 TB, so I'll need to figure out how many more drives are required.
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Judy
10 months ago
Hmm, this looks like a tricky one. I'll need to carefully think through the RAID 5 configuration and how to calculate the minimum number of drives needed.
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Georgene
10 months ago
I think the key here is understanding how the privacy framework is meant to be applied. Option D seems like the most flexible and adaptable approach.
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Malcolm
10 months ago
I'm a bit confused by this question. I'm not super familiar with Alibaba Cloud, so I'm not 100% sure which option is correct. I'll have to review the material again and see if I can figure it out.
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