SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
A company is migrating an on-premises application to AWS. The application requires low-latency access to a file system that can be mounted by multiple EC2 instances simultaneously. Which AWS storage service should they use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon EFS
Amazon EFS is a scalable, elastic file system for Linux-based workloads that can be mounted by multiple EC2 instances simultaneously, providing low-latency access. S3 is object storage, not a file system, so it does not support file-level mounts. Amazon EBS volumes (including multi-attach) are block storage typically attached to a single instance; while io1/io2 with multi-attach can be shared, it is limited and not designed as a general-purpose shared file system. Amazon FSx for Windows File Server is a managed Windows file server, suitable for Windows workloads, but EFS is simpler and more cost-effective for Linux-based applications requiring shared file access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Amazon EFS
Why this is correct
EFS provides a shared file system for multiple instances.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage, not a file system.
- ✗
Amazon FSx for Windows File Server
Why it's wrong here
Amazon FSx for Windows File Server provides SMB-based shared file storage designed for Windows workloads, but the scenario does not specify a Windows environment or Active Directory dependency. The requirement is low-latency access from multiple EC2 instances, which FSx for Windows can deliver, but it is tempting because it offers a fully managed, shared file system. It would be correct if the application required native Windows file sharing, SMB protocol, or integration with Microsoft Entra ID.
- ✗
Amazon EBS
Why it's wrong here
EBS volumes are block storage, typically attached to one instance.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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