SAA-C03 Q450 · Storage

Question

A company is running a media store across multiple Amazon EC2 instances distributed across multiple Availability Zones in a single VPC. The company wants a high-performing solution to share data between all the EC2 instances, and prefers to keep the data within the VPC only. What should a solutions architect recommend?

Accepted Answer

**Amazon EFS** is the correct answer because it satisfies every requirement:

1. **Shared data between all EC2 instances**: EFS is a fully managed **NFS (Network File System)** that can be simultaneously mounted by thousands of EC2 instances. All instances read and write to the same file system with strong consistency.

2. **Multiple Availability Zones**: EFS is designed as a **Regional service** — it stores data redundantly across multiple AZs and allows mount targets in each AZ. Instances in different AZs can all access the same file system seamlessly.

3. **High-performing**: EFS offers multiple performance modes (General Purpose and Max I/O) and throughput modes (Bursting, Provisioned, Elastic). For a media store workload, EFS can deliver the throughput and IOPS needed.

4. **Data stay

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