Which managed file system can be mounted and shared by multiple Linux EC2 instances at the same time and scales automatically as stored capacity grows?

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Select an answer
CorrectC

Explanation

Question Overview

Selecting a managed file system that multiple EC2 instances can share.

Requirements to satisfy
  • 1「mounted and shared by multiple Linux EC2 instances at the same time」A shared file system = EFS
  • 2「shared」Multiple instances access the same data
  • 3「scales automatically」The EFS characteristic of expanding automatically with capacity
Per-option explanation
AIncorrect

Amazon EBS

Amazon EBS is block storage that is attached to a single EC2 instance.

It does not serve as a file system that multiple instances mount and share concurrently, so it is incorrect.

BIncorrect

Amazon FSx for Windows File Server

Amazon FSx for Windows File Server is a Windows shared file system that uses the SMB protocol.

It is also a shared file system, but the requirement to mount over NFS from Linux EC2 instances and scale automatically is met by EFS, so it is incorrect.

CCorrect

Amazon EFS

Correct. Amazon EFS (Elastic File System) is a managed NFS file system that multiple Linux EC2 instances can mount and share at the same time. It scales automatically as stored capacity grows and is highly available across multiple Availability Zones. It is used for shared content and home directories.

DIncorrect

Amazon S3

Amazon S3 is object storage accessed through an HTTP API.

Multiple locations can access the same data, but it is not a file system that is mounted on the OS, so EFS fits the requirement and this is incorrect.

Key Takeaway

'Shared by multiple EC2 instances', 'automatic scaling', and 'NFS file system' point to Amazon EFS. The disk of a single EC2 instance is EBS, objects are S3, and Windows (SMB) sharing is FSx for Windows File Server. Distinguish by shared vs. dedicated and by protocol.

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