Quick Answer
The answer is Amazon EFS. This is the best persistent storage for stateful apps on Amazon EKS because it is a regional, fully managed NFS file system that automatically replicates data across multiple Availability Zones, ensuring that if a pod fails, the storage can be reattached to a new pod in any AZ without manual intervention. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how to decouple storage from compute lifecycle in Kubernetes, often contrasting EFS with EBS, which is AZ-specific and cannot be mounted concurrently across zones. A common trap is choosing Amazon EBS gp3 for its performance, but EBS volumes are tied to a single AZ and require manual reattachment or CSI snapshotting after a pod failure, making them less resilient for multi-AZ clusters. Remember the key distinction: EFS is regional and shared, EBS is zonal and exclusive—for stateful apps that must survive AZ outages, think “EFS for elasticity and failover.”
This DOP-C02 practice question tests your understanding of resilient cloud 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 deploying a stateful application on Amazon EKS. The application requires persistent storage that can be reattached to a new pod if the original pod fails. The cluster spans multiple Availability Zones. Which storage solution provides the BEST resilience and meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Amazon S3 bucket with a mountpoint.
Why wrong: S3 is object storage, not a file system; may not support all file operations.
Amazon EBS with gp3 volume type.
Why wrong: EBS volumes are tied to one AZ and cannot be reattached in another AZ.
EC2 instance store volumes.
Why wrong: Instance store is ephemeral and data is lost on pod failure.
Amazon EFS file system.
EFS is regional and can be mounted from any AZ, providing resilience.
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 provides a fully managed, regional NFS file system that can be mounted concurrently by multiple pods across different Availability Zones. It is designed for high availability and durability, automatically replicating data across multiple AZs, and supports automatic reattachment to a new pod if the original pod fails, making it the best choice for stateful applications requiring resilient, shared persistent storage on Amazon EKS.
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 with a mountpoint.
Why it's wrong here
S3 is object storage, not a file system; may not support all file operations.
Amazon EBS with gp3 volume type.
Why it's wrong here
EBS volumes are tied to one AZ and cannot be reattached in another AZ.
EC2 instance store volumes.
Why it's wrong here
Instance store is ephemeral and data is lost on pod failure.
Amazon EFS file system.
Why this is correct
EFS is regional and can be mounted from any AZ, providing resilience.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often assume EBS is the default persistent storage for Kubernetes because of its common use with single-node stateful workloads, but they overlook the multi-AZ requirement that makes EBS unsuitable due to its zonal scope, while EFS's regional nature provides the necessary cross-AZ resilience.
Detailed technical explanation
Amazon EFS uses the NFSv4.1 protocol and provides a regional file system with automatic replication across multiple Availability Zones, ensuring data durability and availability even during an AZ outage. Under the hood, EFS leverages a distributed data plane that allows concurrent access from thousands of EC2 instances or EKS pods, with performance modes (General Purpose and Max I/O) and throughput modes (Bursting and Provisioned) to match workload demands. In a real-world scenario, a stateful application like a content management system or a shared configuration store benefits from EFS's ability to maintain consistent file locks and metadata across pods, avoiding the single-AZ limitation of EBS.
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
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FAQ
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon EFS file system. — Amazon EFS provides a fully managed, regional NFS file system that can be mounted concurrently by multiple pods across different Availability Zones. It is designed for high availability and durability, automatically replicating data across multiple AZs, and supports automatic reattachment to a new pod if the original pod fails, making it the best choice for stateful applications requiring resilient, shared persistent storage on Amazon EKS.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DOP-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 DOP-C02 exam.
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