A fleet of Amazon EC2 instances needs to access a shared file system simultaneously. The instances are distributed across multiple Availability Zones in a single VPC. Which storage solution provides high availability and concurrent access?

Answer options:

Amazon EBS Multi-Attach

Amazon EFS

Amazon S3

Amazon EC2 Instance Store

How to approach this question

Look for 'shared file system' and 'multiple Availability Zones'. EFS is the standard regional file system.

Full Answer

B.Amazon EFS✓ Correct

Amazon Elastic File System (EFS) provides a simple, scalable, fully managed elastic NFS file system. It is designed to be highly available and durable, storing data redundantly across multiple AZs, and allows concurrent access from thousands of EC2 instances.

Common mistakes

Selecting EBS Multi-Attach, forgetting it is restricted to a single AZ.

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