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Exam AWS Certified Solutions Architect - Professional topic 1 question 816 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 816
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A company is running a custom database in the AWS Cloud. The database uses Amazon EC2 for compute and uses Amazon Elastic Block Store (Amazon EBS) for storage. The database runs on the latest generation of EC2 instances and uses a General Purpose SSD (gp2) EBS volume for data.
The current data volume has the following characteristics:
✑ The volume is 512 GB in size.
✑ The volume never goes above 256 GB utilization.
✑ The volume consistently uses around 1,500 IOPS.
A solutions architect needs to conduct an analysis of the current database storage layer and make a recommendation about ways to reduce cost.
Which solution will provide the MOST cost savings without impacting the performance of the database?

  • A. Convert the data volume to the Cloud HDD (sc1) type. Leave the volume as 512 GB. Set the volume IOPS to 1,500.
  • B. Convert the data volume to the Provisioned IOPS SSD (io2) type. Resize the volume to 256 GB. Set the volume IOPS to 1,500.
  • C. Convert the data volume to the Provisioned IOPS SSD (io2) Block Express type. Leave the volume as 512 GB. Set the volume IOPS to 1,500.
  • D. Convert the data volume to the General Purpose SSD (gp3) type. Resize the volume to 256 GB. Set the volume IOPS to 1,500.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by GeniusMikeLiu at Jan. 2, 2022, 10:06 a.m.
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ghfalcon7
Highly Voted 2 years, 5 months ago
Selected Answer: C
Resize the volume to 256 GB -> not possible, you can't shrink an ebs volume. You would have to create a new volume and migrate existing data to it. Answer is C IMO
upvoted 5 times
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asfsdfsdf
Highly Voted 2 years, 2 months ago
Selected Answer: D
All answers are wrong - its not possible to shrink EBS - need to create it from scratch so its either A or C A - will not provide the needed IOPS C - super expensive So I guess the only correct option should be D - only problem with it is wording need to "recreate" the volume and also we can set it to 3000
upvoted 5 times
AYANtheGLADIATOR
2 years, 1 month ago
This is a valid point.
upvoted 2 times
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Heer
Most Recent 1 year, 8 months ago
The right ans should be A here : One solution that the solutions architect could recommend is to switch to a lower-performance EBS volume type, such as a Throughput Optimized HDD (st1) or Cold HDD (sc1) volume. These volume types are significantly less expensive than gp2 volumes, but they are also slower and have lower IOPS. Since the current database volume never goes above 256 GB utilization and consistently uses around 1,500 IOPS, it's likely that these volume types would provide enough performance for the database.
upvoted 1 times
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breathingcloud
1 year, 10 months ago
We can resize the existing volume to 256, so we can lean towards C, the only concern is provisioned I/O block express is not supported on all instance type, the question states instance is running on latest generation
upvoted 1 times
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kenchou73
2 years, 1 month ago
Selected Answer: D
https://aws.amazon.com/cn/ebs/general-purpose/
upvoted 4 times
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hilft
2 years, 2 months ago
I would go for B in normal cirumstances but the question is asking for the cost so, D
upvoted 1 times
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bobsmith2000
2 years, 4 months ago
Selected Answer: D
Check here https://aws.amazon.com/ebs/pricing/ A) jeopardises performance. BC) - any io type is more expensive per GB then gp D) the lowers price per GB without affecting performance.
upvoted 3 times
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Jonfernz
2 years, 6 months ago
Selected Answer: D
although gp3 baseline is 3000 iops it is still the most cost efficient.
upvoted 3 times
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czarno
2 years, 6 months ago
Max IOPS for HDD sc1 is indeed 250. Gp3 is becoming the new default in place of gp2. Although you can't set the IOPS of gp3 to 1500 as it's baseline is 3000, I think the question/answer is just slightly wrong and looks a bit different in the actual exam. Which makes D the only correct answer
upvoted 1 times
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Ducer_deuceworld
2 years, 6 months ago
option - D
upvoted 2 times
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Alvindo
2 years, 7 months ago
Selected Answer: A
don't think it;s gp3 since it's baseline performance is 3000 iops: https://aws.amazon.com/ebs/volume-types/ Don't think it's io2 since it's min volume size is 4gb and the iops increase is 500/gb so won't be able to get 1500 iops so i think it's cold hdd
upvoted 1 times
tobstar86
2 years, 6 months ago
D, despite the 3000 IOPS baseline The cold HDD sc1 has a max IOPS volume of 250, therfore can't reached the needed 1500 IOPS. https://aws.amazon.com/ebs/volume-types/
upvoted 3 times
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Z_dane_23
2 years, 7 months ago
I think it's B as io2 block express has the same price as io2, however as they question asks for the cheapest, by reducing size to 256GB it will be the cheaper than block express with 512GB
upvoted 2 times
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jyrajan69
2 years, 7 months ago
All answers are wrong in terms of IOPS of 1500, but process of elimination, A is wrong, it is for data that is long term, cold, B and C do not satisfy the cost aspect, so only possible is D
upvoted 2 times
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vissi
2 years, 8 months ago
AWS designed gp3 to provide predictable 3,000 IOPS baseline performance and 125 MiB/s, regardless of volume size. With gp3 volumes, you can provision IOPS and throughput independently, without increasing storage size, at costs up to 20% lower per GB compared to gp2 volumes. This means you can provision smaller volumes while maintaining high performance, at a cheaper cost.
upvoted 2 times
Yecine11y
2 years, 8 months ago
D seems to be good, but it's wrong cause it's clearly stating "set the IOPS to 1,500" which is impossible : IOPS must be between 3000 and 16000.
upvoted 1 times
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vissi
2 years, 8 months ago
Option D is correct https://aws.amazon.com/blogs/storage/migrate-your-amazon-ebs-volumes-from-gp2-to-gp3-and-save-up-to-20-on-costs/
upvoted 3 times
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ByomkeshDas
2 years, 8 months ago
Option-D. General Purpose SSD (gp3) type
upvoted 1 times
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padel
2 years, 9 months ago
D even if the minimal IOPS is 3'000
upvoted 1 times
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