Quick Answer
The answer is Amazon EFS. This is the correct choice because EFS provides a fully managed, elastic NFS file system that can be mounted as a shared volume across multiple containers within the same ECS Fargate task, enabling persistent, concurrent access to the same data. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of storage integration with containerized workloads, specifically how EFS supports stateful applications on Fargate where EBS volumes are tied to a single instance and cannot be shared, and S3 lacks file-system semantics. A common trap is confusing EBS’s single-attach limitation with the multi-attach requirement of shared storage for ECS Fargate containers using EFS. Remember the memory tip: “EFS for shared files, EBS for a single host’s files.”
This SAP-C02 practice question tests your understanding of design for new solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is running a containerized application on Amazon ECS with Fargate launch type. The application needs to store persistent data that must be shared across multiple containers in the same task. Which storage option should the company use?
Amazon S3 bucket mounted using s3fs
Why wrong: s3fs is not recommended for production; it has performance limitations.
Amazon FSx for Lustre
Why wrong: FSx for Lustre is designed for HPC workloads, not general container storage.
Amazon EBS volume
Why wrong: EBS volumes can only be attached to one instance at a time.
Amazon EFS file system
EFS provides a shared file system that can be mounted by multiple containers.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon EFS file system
Amazon EFS can be mounted as a volume that is shared across containers in the same ECS task. Option A (EBS) cannot be shared across containers. Option B (S3) is object storage, not a file system. Option C (FSx for Lustre) is for high-performance computing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Amazon S3 bucket mounted using s3fs
Why it's wrong here
s3fs is not recommended for production; it has performance limitations.
Amazon FSx for Lustre
Why it's wrong here
FSx for Lustre is designed for HPC workloads, not general container storage.
Amazon EBS volume
Why it's wrong here
EBS volumes can only be attached to one instance at a time.
Amazon EFS file system
Why this is correct
EFS provides a shared file system that can be mounted by multiple containers.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon EFS file system — Amazon EFS can be mounted as a volume that is shared across containers in the same ECS task. Option A (EBS) cannot be shared across containers. Option B (S3) is object storage, not a file system. Option C (FSx for Lustre) is for high-performance computing.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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.
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