PAS-C01 Amazon EFS Practice Question
A company runs SAP on AWS with a distributed system: an SAP Central Services (ASCS) instance, a primary application server (PAS), and additional dialog instances (DI). All instances are in a single Availability Zone. The company wants to implement high availability for the ASCS instance using a shared filesystem for the /sapmnt directory. The ASCS instance uses a single EBS volume for /sapmnt. The operations team plans to use a Network File System (NFS) solution to share /sapmnt between instances. Which approach should the team use to achieve a highly available shared filesystem?
⚠ Common exam trap
Candidates may think that a shared EBS volume with a cluster filesystem is the way to go, but Amazon EFS is a fully managed NFS solution that provides high availability without requiring manual clustering.
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
✓
Deploy Amazon EFS and mount it on all instances as /sapmnt.
Amazon EFS provides a managed NFS filesystem that is highly available and durable across multiple Availability Zones, eliminating the single point of failure. It can be mounted on multiple EC2 instances simultaneously, making it suitable for sharing /sapmnt. Option A is incorrect because Amazon FSx for Windows File Server is designed for Windows-based workloads, not Linux-based SAP systems. Option B is incorrect because instance store volumes are ephemeral and data is lost on instance stop/termination. Option C is incorrect because a single EBS volume cannot be attached to multiple instances simultaneously (except with a cluster filesystem like OCFS2, which is complex and not recommended for this use case).
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 FSx for Windows File Server to host the /sapmnt share.
Why it's wrong here
FSx for Windows is not optimized for SAP on Linux.
- ✗
Use an instance store volume on the ASCS instance and share it via NFS.
Why it's wrong here
Instance store is ephemeral and not persistent.
- ✗
Create a secondary EBS volume and attach it to both the ASCS and PAS instances, then use a cluster-aware filesystem like OCFS2.
Why it's wrong here
Multi-attach EBS does not support multiple writers without a cluster filesystem, and it's complex.
- ✓
Deploy Amazon EFS and mount it on all instances as /sapmnt.
Why this is correct
EFS is a managed NFS service that is highly available and persistent.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 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 PAS-C01 exam.