SAP-C02 Design for New Solutions Practice Question
A company is migrating a legacy on-premises application to AWS. The application requires a shared file system that can be mounted by multiple EC2 instances concurrently, with strong consistency and low-latency access. Which AWS storage solution should be used?
⚠ Common exam trap
Candidates often confuse Amazon EBS multi-attach with a shared file system, but EBS multi-attach is a block-level shared volume limited to a single AZ and does not provide file-level locking or POSIX semantics, making it unsuitable for concurrent file system access.
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 provides a fully managed, scalable, and elastic NFS file system that can be mounted concurrently by multiple EC2 instances across multiple Availability Zones. It offers strong read-after-write consistency and low-latency access, making it ideal for shared file workloads requiring POSIX permissions and concurrent 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.
- ✗
AWS Storage Gateway File Gateway
Why it's wrong here
File Gateway provides file access to S3 but adds latency and is not a native shared file system.
- ✓
Amazon EFS
Why this is correct
EFS provides a fully managed, scalable NFS file system that can be mounted by many instances with strong consistency.
- ✗
Amazon EBS with multi-attach enabled
Why it's wrong here
EBS multi-attach is limited to a few instances and is not a shared file system.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage, not a file system, and does not support file locking or low-latency access.
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 |
Go deeper
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