SAP-C02 Design for New Solutions Practice Question
A company is designing a new container-based application using Amazon EKS. The application requires persistent storage for stateful workloads, such as databases. The storage must be highly available and durable across multiple Availability Zones. Which storage solution should be used?
⚠ Common exam trap
Test-takers frequently confuse EBS's single-AZ attachment with multi-AZ availability, or mistakenly think S3's CSI driver provides file-level access, when in fact EFS is the only AWS managed file system that natively supports multi-AZ access and the Kubernetes CSI standard for stateful workloads.
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
✓
Use Amazon EFS with the EFS CSI driver.
Amazon EFS provides a fully managed, elastic NFS file system that is accessible from multiple Amazon EKS worker nodes across different Availability Zones simultaneously. The EFS CSI driver enables Kubernetes pods to mount EFS as a persistent volume, delivering the required high availability and durability for stateful workloads like databases without single-AZ dependency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Amazon EBS volumes with the EBS CSI driver.
Why it's wrong here
EBS volumes are AZ-specific and cannot be shared across AZs.
- ✗
Use Amazon FSx for Lustre as a shared file system.
Why it's wrong here
FSx for Lustre is optimized for HPC workloads, not general-purpose persistent storage.
- ✓
Use Amazon EFS with the EFS CSI driver.
Why this is correct
EFS is a regional, highly available file system that can be mounted by containers across AZs.
- ✗
Use Amazon S3 with the S3 CSI driver.
Why it's wrong here
S3 is object storage and not a POSIX-compliant file system; not suitable for databases.
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