SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
A company is migrating a containerized application to Amazon ECS. The application requires persistent storage that can be shared across multiple containers running on different EC2 instances. Which storage solution should they use?
⚠ Common exam trap
The trap is assuming any AWS storage service can be shared across instances; candidates often pick EBS or S3 without recognizing that only EFS (and FSx variants) provide POSIX-compliant shared file storage mountable by multiple EC2 instances simultaneously.
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, elastic NFS file system that can be mounted simultaneously by multiple EC2 instances across Availability Zones, making it the correct choice for shared persistent storage across containers on different hosts. ECS tasks on EC2 launch type can mount EFS volumes using the EFS mount helper, enabling concurrent read/write access. This satisfies the requirement for shared persistent storage that survives container restarts and is accessible from multiple nodes.
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 FSx for Lustre
Why it's wrong here
FSx for Lustre provides a high-performance parallel file system for HPC and machine learning workloads, and its scratch deployment is non-persistent. It would be correct for compute-intensive shared scratch data, not durable container storage. EFS offers shared, persistent POSIX storage across AZs.
- ✗
Amazon EBS
Why it's wrong here
Amazon EBS volumes attach to a single EC2 instance in one Availability Zone, so containers on different instances cannot share them concurrently. It is tempting because EBS is the default persistent block storage for EC2, and would be correct for a single-instance workload needing low-latency block access.
- ✓
Amazon EFS
Why this is correct
Amazon EFS provides a shared, elastic NFS file system that mounts concurrently on EC2 instances in multiple Availability Zones, so containers on different hosts read and write the same data. EBS volumes attach to a single instance and cannot satisfy the shared-storage requirement.
- ✗
Amazon S3
Why it's wrong here
Amazon S3 is object storage accessed over HTTP APIs, not a POSIX filesystem, so containers cannot mount it as shared persistent storage. It is tempting because S3 is durable, shareable and cheap, and would be correct for storing artefacts or static objects, not for filesystem semantics.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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.