CV0-004 Deployment Practice Question
A cloud engineer is deploying a stateful application on Amazon EKS. The application requires persistent storage that must be highly available and automatically replicated across multiple Availability Zones. The engineer needs to define the storage class in Kubernetes. Which storage class provisioner should be used?
⚠ Common exam trap
The trap here is assuming that high-performance block storage like EBS or FSx automatically provides multi-AZ replication, when in fact they are typically tied to a single AZ unless configured otherwise.
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
✓
efs.csi.aws.com
Amazon EFS, accessed via the EFS CSI driver, is the correct choice for persistent storage that is automatically replicated across multiple Availability Zones. It provides a shared file system that can be mounted by multiple pods across AZs, ensuring high availability. Other options either are single-AZ, not replicated, or ephemeral.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
fsx.csi.aws.com with Lustre
Why it's wrong here
FSx for Lustre is a high-performance file system for compute-intensive workloads, but it is not automatically replicated across multiple Availability Zones by default. It is designed for scratch or persistent storage tied to a single AZ, and multi-AZ replication requires additional configuration and cost. It does not inherently provide the cross-AZ high availability needed.
- ✓
efs.csi.aws.com
Why this is correct
Amazon EFS is a managed file system that provides shared, elastic storage across multiple Availability Zones. The EFS CSI driver allows Kubernetes to dynamically provision persistent volumes backed by EFS, which is automatically replicated across AZs within a region. This makes it ideal for stateful applications requiring high availability and multi-AZ resilience.
- ✗
ebs.csi.aws.com with volume type io1
Why it's wrong here
The EBS CSI driver with io1 volume type provides high-performance SSD storage, but EBS volumes are tied to a single Availability Zone and cannot be replicated across multiple AZs automatically. For a stateful application requiring multi-AZ replication, EBS is not suitable unless using a replication solution at the application level. Thus, it does not meet the high availability requirement.
- ✗
local.csi.aws.com
Why it's wrong here
Local volumes are ephemeral and tied to a specific node, providing no replication or high availability across AZs. They are suitable for temporary data or caching, not for stateful applications that require persistent, replicated storage. Using local volumes would risk data loss if the node fails.
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 |
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.