SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company is migrating an on-premises application to AWS. The application requires persistent shared storage that can be accessed by multiple EC2 instances simultaneously with strong consistency. Which AWS storage solution should the company 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 fully managed NFS file system that can be mounted by multiple EC2 instances and provides strong consistency. Option A is incorrect because Amazon S3 with S3 File Gateway provides file access to S3 but S3 is eventually consistent for overwrites, not strongly consistent. Option B is incorrect because Amazon S3 Glacier Deep Archive is designed for long-term archival storage with retrieval times of hours, not for active shared storage. Option C is incorrect because Amazon EBS with Multi-Attach enabled allows a single EBS volume to be attached to multiple instances, but it is block storage and requires a cluster-aware file system; it is not a fully managed shared file system.
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 S3 with S3 File Gateway.
Why it's wrong here
Amazon S3 with S3 File Gateway provides file access to S3, but S3 is eventually consistent for overwrites and does not guarantee strong consistency like a file system.
- ✗
Amazon S3 Glacier Deep Archive.
Why it's wrong here
Amazon S3 Glacier Deep Archive is designed for long-term archival storage with retrieval times of hours, not suitable for low-latency shared storage.
- ✗
Amazon EBS with Multi-Attach enabled.
Why it's wrong here
Amazon EBS with Multi-Attach allows a single EBS volume to be attached to multiple instances, but it is block-level storage and requires a cluster-aware file system; it is not a fully managed shared file system.
- ✓
Amazon EFS
Why this is correct
Amazon EFS is a fully managed NFS file system that can be mounted by many EC2 instances with strong consistency, making it the correct choice.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAP-C02 exam.