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Exam AWS Certified Solutions Architect - Professional topic 1 question 405 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional
Question #: 405
Topic #: 1
[All AWS Certified Solutions Architect - Professional Questions]

A company is currently running a production workload on AWS that is very I/O intensive. Its workload consists of a single tier with 10 c4.8xlarge instances, each with 2 TB gp2 volumes. The number of processing jobs has recently increased, and latency has increased as well. The team realizes that they are constrained on the IOPS. For the application to perform efficiently, they need to increase the IOPS by 3,000 for each of the instances.
Which of the following designs will meet the performance goal MOST cost effectively?

  • A. Change the type of Amazon EBS volume from gp2 to io1 and set provisioned IOPS to 9,000.
  • B. Increase the size of the gp2 volumes in each instance to 3 TB.
  • C. Create a new Amazon EFS file system and move all the data to this new file system. Mount this file system to all 10 instances.
  • D. Create a new Amazon S3 bucket and move all the data to this new bucket. Allow each instance to access this S3 bucket and use it for storage.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
Reference:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Storage.html
by donathon at Oct. 1, 2019, 3:21 a.m.
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donathon
Highly Voted 3 years, 7 months ago
B A: IO1 or provisioned IOPS SSD is more expensive. B: GP1 with 2TB volumes has 6000 IOPS. If we add additional 1TB it will increase by another 3000 IOPS. Note: Bursting and I/O credits are only relevant to volumes under 1,000 GiB, where burst performance exceeds baseline performance. C\D: Not enough information is actually provided for us so we don’t know if the instance can use shared storage or not.
upvoted 54 times
Moon
3 years, 7 months ago
Answer "B", well explained.
upvoted 3 times
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01037
3 years, 5 months ago
Thanks for the explanation. https://aws.amazon.com/ebs/pricing/ gp2 $0.10 per GB-month of provisioned storage io1 $0.125 per GB-month of provisioned storage AND $0.065 per provisioned IOPS-month
upvoted 2 times
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amog
Highly Voted 3 years, 6 months ago
1TB for 3000 IOPS Answer is B https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Storage.html
upvoted 7 times
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p2010
Most Recent 2 years, 11 months ago
Selected Answer: B
B: GP1 with 2TB volumes has 6000 IOPS. If we add additional 1TB it will increase by another 3000 IOPS. Note: Bursting and I/O credits are only relevant to volumes under 1,000 GiB, where burst performance exceeds baseline performance.
upvoted 1 times
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cldy
3 years, 3 months ago
B: CORRECT
upvoted 1 times
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AzureDP900
3 years, 4 months ago
B is right
upvoted 1 times
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vbal
3 years, 4 months ago
gp2: baseline performance scales linearly at 3 IOPS per GiB of volume size.
upvoted 1 times
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cldy
3 years, 4 months ago
B. Increase the size of the gp2 volumes in each instance to 3 TB.
upvoted 1 times
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AzureDP900
3 years, 4 months ago
B is right
upvoted 1 times
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sashenka
3 years, 5 months ago
If you carefully read the requirements they are asking for "most effectively". No mention of COST!!! So anything to do with cost should not be part of the consideration. That said, an argument can be made that option A: IO1 IOPS SSD is the MOST EFFECTIVE!
upvoted 3 times
user0001
2 years, 11 months ago
I totally agree with you, there is no mention of most cost-effective , A is a better option in this case as you wont pay for additional storage
upvoted 2 times
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nsvijay04b1
2 years, 5 months ago
read ques .. "most COST effective"
upvoted 1 times
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andylogan
3 years, 5 months ago
It's B
upvoted 1 times
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runtheworld
3 years, 5 months ago
B: Increase from 2TB (6000IOPS) to 9000IOPS, difference is 1TB(3000IOPS).
upvoted 1 times
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WhyIronMan
3 years, 5 months ago
I'll go with B
upvoted 1 times
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wind
3 years, 5 months ago
B for sure.
upvoted 1 times
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Kian1
3 years, 5 months ago
Ans B for me
upvoted 2 times
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Ebi
3 years, 5 months ago
Answer is B
upvoted 4 times
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sanjaym
3 years, 5 months ago
B for sure.
upvoted 1 times
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gookseang
3 years, 5 months ago
B for sure
upvoted 1 times
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