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Elastic Block Store Quiz

47,097

An application needs to have a database hosted in AWS. The database will be hosted on an EC2 Instance. The application itself does not have a high usage ratio, hence the reads and writes on the database would be limited to a bare minimum. What is the MOST suitable storage type that could be used by the underlying EC2 instance hosting the database?

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
AWS recommends that for small workloads it is better to use General Purpose SSD volume (gp2) than Throughput Optimized HDD volumes.(st1).As per the AWS docs :Throughput Optimized HDD (st1) VolumesThroughput Optimized HDD (st1) volumes provide low-cost magnetic storage that defines performance in terms of throughput rather than IOPS. This volume type is a good fit for large, sequential workloads such as Amazon EMR, ETL, data warehouses, and log processing. Bootable st1 volumes are not supported.Throughput Optimized HDD (st1) volumes, though similar to Cold HDD (sc1) volumes, are designed to support frequently accessed data.Note:This volume type is optimized for workloads involving large, sequential I/O, and we recommend that customers with workloads performing small, random I/O use gp2. For more information, see Inefficiency of Small Read/Writes on HDD.https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumeTypes.html#inefficiencyAmazon Elastic File System (Amazon EFS) provides simple, scalable file storage for use with Amazon EC2. With Amazon EFS, storage capacity is elastic, growing and shrinking automatically as you add and remove files, so your applications have the storage they need, when they need it. The service is designed to be highly scalable, highly available, and highly durable. Amazon EFS file systems store data and metadata across multiple Availability Zones in a region and can grow to petabyte scale, drive high levels of throughput, and allow massively parallel access from Amazon EC2 instances to your data.In question they mentioned that “The application itself does not have a high usage ratio, hence the reads and writes on the database would be limited to a bare minimum”. Ability to Reads & Writes of an application depends on IOPS ratio.Since the database is not going to be used that frequently, you should ideally choose the EBS General Purpose SSD over EBS provisioned IOPS SSD.
For more information on AWS EBS Volumes, please visit the following URL:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumes.html

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