- A
Amazon S3 bucket mounted using s3fs
Why wrong: s3fs is not recommended for production; it has performance limitations.
- B
Amazon FSx for Lustre
Why wrong: FSx for Lustre is designed for HPC workloads, not general container storage.
- C
Amazon EBS volume
Why wrong: EBS volumes can only be attached to one instance at a time.
- D
Amazon EFS file system
EFS provides a shared file system that can be mounted by multiple containers.
Question 663 of 1,746
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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?
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 file system
Amazon EFS provides a shared, persistent, and scalable NFS file system that can be mounted concurrently by multiple containers within the same ECS task using Fargate. EFS supports the NFSv4.1 protocol, enabling simultaneous read/write access from multiple containers, which meets the requirement for shared persistent storage across containers in the same task.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 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
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon EBS with a shared storage solution, but EBS volumes are zonal and single-instance attachable, making them incompatible with multi-container sharing in Fargate, whereas EFS is the only AWS-native, shared, persistent file system that works seamlessly with Fargate.
Detailed technical explanation
How to think about this question
Under the hood, EFS uses a distributed file system architecture that automatically scales storage capacity and throughput as files are added or modified, and it supports the NFSv4.1 protocol with lock management for concurrent access. In a Fargate task, the EFS file system is mounted via the ECS task definition using the `volumes` and `mountPoints` configuration, and the EFS access point can enforce POSIX permissions and a root directory per task. A real-world scenario is a content management system where multiple containers in the same task need to read and write uploaded files simultaneously, such as a web server container and a background processing container sharing an uploads directory.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Design for New Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EFS file system — Amazon EFS provides a shared, persistent, and scalable NFS file system that can be mounted concurrently by multiple containers within the same ECS task using Fargate. EFS supports the NFSv4.1 protocol, enabling simultaneous read/write access from multiple containers, which meets the requirement for shared persistent storage across containers in the same task.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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