Quick Answer
The answer is Amazon EFS for the shared filesystem. This is correct because Amazon EFS provides a fully managed, elastic NFS filesystem that can be mounted concurrently by EC2 instances across multiple Availability Zones, making it the only native AWS storage service that meets the requirement for a shared, highly available filesystem for SAP ASCS and ERS clusters managed by Pacemaker. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of shared storage limitations—specifically that EBS Multi-Attach only works within a single AZ and that S3 is object storage, not a POSIX filesystem. A common trap is assuming EBS can be shared across AZs, but EFS is purpose-built for this multi-AZ HA scenario. Memory tip: For SAP ASCS HA across AZs, remember “EFS for Every Filesystem Shared”—it’s the only shared NFS that spans AZs natively.
This PAS-C01 practice question tests your understanding of technology. 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 SAP NetWeaver on AWS and wants to ensure high availability for the SAP Central Services (ASCS) and Enqueue Replication Server (ERS). They plan to use a cluster manager (Pacemaker) with a shared filesystem. The cluster will span two Availability Zones. The storage for the shared filesystem must be highly available and provide consistent performance. What storage solution should be used?
Use an Amazon S3 bucket as the shared filesystem.
Why wrong: S3 is not a filesystem.
Use instance store volumes (Local SSDs) on each node.
Why wrong: Not shared and ephemeral.
Use an Amazon EBS volume with Multi-Attach enabled.
Why wrong: Multi-Attach only works within the same AZ.
Use Amazon EFS for the shared filesystem.
EFS provides NFS across AZs with HA.
Answer choices
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 for the shared filesystem.
Option C is correct. Amazon EFS provides a shared NFS filesystem that can be mounted from multiple instances across AZs, offering high availability and consistent performance. Option A is wrong because EBS volumes cannot be attached to multiple instances across AZs (Multi-Attach only works within same AZ). Option B is wrong because S3 is object storage, not a filesystem. Option D is wrong because Local SSDs are ephemeral and not shared.
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.
Use an Amazon S3 bucket as the shared filesystem.
Why it's wrong here
S3 is not a filesystem.
Use instance store volumes (Local SSDs) on each node.
Why it's wrong here
Not shared and ephemeral.
Use an Amazon EBS volume with Multi-Attach enabled.
Why it's wrong here
Multi-Attach only works within the same AZ.
Use Amazon EFS for the shared filesystem.
Why this is correct
EFS provides NFS across AZs with HA.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
The correct answer is: Use Amazon EFS for the shared filesystem. — Option C is correct. Amazon EFS provides a shared NFS filesystem that can be mounted from multiple instances across AZs, offering high availability and consistent performance. Option A is wrong because EBS volumes cannot be attached to multiple instances across AZs (Multi-Attach only works within same AZ). Option B is wrong because S3 is object storage, not a filesystem. Option D is wrong because Local SSDs are ephemeral and not shared.
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is deploying SAP NetWeaver on AWS and needs to ensure high availability for the SAP Central Services (ASCS) instance. Which TWO AWS features should be used together to achieve this?
mediumWhy A: Amazon EFS provides a shared filesystem for the ASCS cluster, and a Network Load Balancer (NLB) is used to distribute traffic to the active ASCS instance. S3 is not suitable for shared files, and Multi-AZ for RDS is for databases, not ASCS.
Variation 2. A company is migrating an SAP system to AWS and needs to ensure high availability for the SAP Central Services (ASCS) instance. Which architecture should be used to meet this requirement?
mediumWhy A: Option B is correct because SAP ASCS can be set up in a cluster across multiple Availability Zones using shared storage (e.g., Amazon EFS or FSx) and a cluster manager like Pacemaker. Option A is wrong because a single EC2 instance does not provide high availability. Option C is wrong because an Auto Scaling group is for horizontal scaling of stateless applications, not for SAP ASCS. Option D is wrong because placing both nodes in the same AZ does not protect against AZ failure.
Variation 3. A company is deploying SAP NetWeaver on AWS and needs to set up high availability for the SAP Central Services (ASCS) and Enqueue Replication Server (ERS). The company uses a shared file system for the transport directory. Which components are essential for the HA setup? (Choose TWO.)
mediumWhy B: Options A and D are correct. A: A load balancer is needed for virtual IP. D: AS CS and ERS must be in different AZs for HA. Option B is wrong because ASCS and ERS should be on separate instances. Option C is wrong because Multi-AZ is for RDS, not for ASCS/ERS. Option E is wrong because S3 is not used for transport in this scenario.
Variation 4. A company is migrating an SAP ERP system to AWS and needs to ensure high availability for the SAP Central Services (ASCS) and Enqueue Replication Server (ERS). The solution must use a shared file system for the SAP transport directory. Which combination of AWS services should be used?
hardWhy C: Option D is correct because Amazon EFS provides a shared NFS file system for the transport directory, and using two EC2 instances in an active/passive configuration with a floating IP (e.g., via Route 53 or Elastic IP reassignment) provides high availability for ASCS/ERS. Option A is incorrect because EBS volumes cannot be attached to multiple instances simultaneously. Option B is incorrect because S3 is not a POSIX-compliant file system for SAP. Option C is incorrect because Amazon FSx for Windows File Server is for Windows workloads, not Linux SAP.
Last reviewed: Jun 20, 2026
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