Elastic Block Store Quiz
An application with a 150 GB relational database runs on an EC2 Instance.
While the application is used infrequently with small peaks in the morning and evening, what is the MOST cost effective storage type among the options below?
A. Amazon EBS provisioned IOPS SSD
B. Amazon EBS Throughput Optimized HDD
C. Amazon EBS General Purpose SSD
D. Amazon EFS
C. Amazon EBS General Purpose SSD
Since the database is used infrequently and not throughout the day, and the question mentions the MOST cost effective storage type, the preferred choice would be EBS General Purpose SSD over EBS provisioned IOPS SSD.
The minimum volume of Throughput Optimized HDD is 500 GB. As per our scenario, we need 150 GB only. Hence, option C: Amazon EBS General Purpose SSD, would be the best choice for cost-effective.
For more information on AWS EBS Volumes, please visit the following URL:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumes.html
Note:
SSD-backed volumes are optimized for transactional workloads involving frequent read/write operations with small I/O size, where the dominant performance attribute is IOPS. The question is focusing on a relational DB where we will give importance to Input/output operations per second. Hence gp2 seems to be a good option in this case. Since the question does not mention on any mission-critical low-latency requirement PIOPS is not required.
HDD-backed volumes are optimized for large streaming workloads where throughput (measured in MiB/s) is a better performance measure than IOPS.
