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Exam AWS Certified Solutions Architect - Professional topic 1 question 150 discussion

A user has configured EBS volume with PIOPS. The user is not experiencing the optimal throughput.
Which of the following could not be factor affecting I/O performance of that EBS volume?

  • A. EBS bandwidth of dedicated instance exceeding the PIOPS
  • B. EBS volume size
  • C. EC2 bandwidth
  • D. Instance type is not EBS optimized
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Suggested Answer: B 🗳️
If the user is not experiencing the expected IOPS or throughput that is provisioned, ensure that the EC2 bandwidth is not the limiting factor, the instance is EBS- optimized (or include 10 Gigabit network connectivity) and the instance type EBS dedicated bandwidth exceeds the IOPS more than he has provisioned.
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html

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Exam_boy
Highly Voted 3 years, 5 months ago
A. EBS bandwidth of dedicated instance exceeding the PIOPS If the user is not experiencing the expected IOPS or throughput that is provisioned, ensure that the EC2 bandwidth is not the limiting factor, the instance is EBS-optimized (or include 10 Gigabit network connectivity) and the instance type EBS dedicated bandwidth exceeds the IOPS more than he has provisioned. http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html
upvoted 9 times
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codeScalable
Most Recent 15 hours, 44 minutes ago
Selected Answer: B
Answer is B bcos we are provisioned IOPS is being used. Meaning we have the needed IOPS regardless of the volume size
upvoted 1 times
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amministrazione
7 months ago
B. EBS volume size
upvoted 1 times
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TigerInTheCloud
2 years, 2 months ago
Selected Answer: B
A. This answer seems like a choice. Does 'exceeding' IPOS means it does not limit the I/O performance? B. Size is not an issue as you can not provision IOPS more than the limit of the IOPS/size ratio. There is the maximum ratio of provisioned IOPS and volume size maximum ratio of provisioned IOPS to requested volume size. C. There is a limit on EC2 network bandwidth (and vary by instance type/size) D. Some instance types are not EBS optimized by default, and some even cannot be EBS optimized
upvoted 1 times
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Alexey79
2 years, 6 months ago
Selected Answer: B
Why B: EBS Volume Type Provision IOPS (io) can’t increase IOPS per Volume Size (GB), only on gp2 Volume Types. Because of that, it can NOT “be a factor impacting the EBS volume's I/O performance”.
upvoted 1 times
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MichaelHuang
3 years, 4 months ago
The Answer would be B, if the question of A is: " EBS bandwidth of dedicated instance NOT exceeding the PIOPS"
upvoted 4 times
Table2022
3 years, 4 months ago
Agree for B, don't even need to think, question is asking "could not be the factor affecting I/O performance".
upvoted 2 times
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fullaws
3 years, 4 months ago
B is correct
upvoted 2 times
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examacc
3 years, 5 months ago
oops.. dint see NOT
upvoted 3 times
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examacc
3 years, 5 months ago
I think D you get performance with PIOPS volumes with ebs optimized instances
upvoted 2 times
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uopspop
3 years, 5 months ago
Why A is wrong? Isn't is great that we have more bandwidth than PIOPS. How could this be wrong. B should be correct because there is a ratio of PIOPS/volume size
upvoted 1 times
tan9
3 years, 5 months ago
Volume size related to the PIOPS you can choose in the CONFIGURATION TIME only.
upvoted 1 times
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