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
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
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
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”.
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
Volume size related to the PIOPS you can choose in the CONFIGURATION TIME only.
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