SAA-C03 Q672 · Storage

Question

A company is migrating a Linux-based web server group to AWS. The web servers must access shared files by using the NFS protocol. The company must not make any changes to the web server application. Which solution will meet these requirements?

Accepted Answer

**Amazon EFS (Elastic File System)** is the correct answer because it satisfies every requirement:

1. **NFS protocol**: EFS natively supports **NFSv4.0 and NFSv4.1** protocols. This is its fundamental access method — it's literally a managed NFS file system.

2. **Shared file access**: EFS is designed for **concurrent access from multiple EC2 instances**. Thousands of instances can read and write simultaneously to the same file system.

3. **No application changes required**: Since the web servers already use NFS, mounting an EFS file system is identical to mounting any NFS share. The application sees a standard POSIX-compliant file system with standard directory structure, file locking, and permissions. Zero code changes needed.

4. **Linux-based**: EFS is designed specifically for **Lin

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