You have a fleet of Linux EC2 Instances. They need to have a shared data store, where the file system needs to be mounted on a fleet of instances. The size of the items will vary from 1KB to 300 MB. The maximum size of the data store will be 3TB. The data needs to have a consistent read view. There are few changes to the data with reasonably no conflicts. Which of the following would be the ideal data store for the fleet of Instances?

Answer options:

A.Elastic File System
B.Amazon S3
C.Amazon EBS Volumes
D.Amazon DynamoDB

Correct Answer: A
The following is mentioned in the AWS Documentation when it comes to the features of EFS.
Amazon EFS file systems can automatically scale from gigabytes to petabytes of data without needing to provision storage. Tens, hundreds, or even thousands of Amazon EC2 instances can simultaneously access an Amazon EFS file system. Amazon EFS provides consistent performance to each Amazon EC2 instance.
Amazon EFS provides a file system interface, file system access semantics (such as strong consistency and file locking), and concurrently-accessible storage for up to thousands of Amazon EC2 instances.
Option B is invalid since this is used for object-level storage that is available from the Internet.
Option C is invalid since this is used for local block-level storage for EC2 Instances.
Option D is invalid since this is used for the NoSQL database and ideally not suitable for such large item data sizes.
For more information on the EFS file system, please refer to the below URL-
https://aws.amazon.com/efs/faq/