The correct answer is to deploy ASCS and ERS in different Availability Zones and use a cluster placement group for the instances. This configuration ensures that if one AZ fails, SAP Central Services can fail over to the other AZ, while the cluster placement group provides the low-latency, high-bandwidth connectivity essential for synchronous replication and heartbeat communication between the two instances. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how to architect SAP high availability across AZs using Pacemaker with fencing and STONITH, a common design pattern for SAP Central Services. A frequent trap is assuming that a single AZ with a placement group is sufficient, but true high availability requires AZ-level fault isolation. Remember the mnemonic “AZs for survival, placement for speed” to recall that cross-AZ deployment ensures uptime, while the placement group guarantees the fast, reliable cluster communication needed for failover.
PAS-C01 Design of SAP Workloads on AWS Practice Question
This PAS-C01 practice question tests your understanding of design of sap workloads on aws. 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 planning to deploy SAP S/4HANA on AWS with high availability. Which TWO actions should be taken to achieve high availability for the SAP Central Services (ASCS/ERS) instance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy ASCS and ERS in different Availability Zones.
Option D is correct because deploying ASCS and ERS in different Availability Zones (AZs) ensures that if one AZ fails, the SAP Central Services can fail over to the other AZ, maintaining high availability. This aligns with AWS best practices for SAP HANA HA, which typically uses a Pacemaker cluster across AZs with fencing and STONITH to handle failover. Option E is correct because a cluster placement group provides low-latency, high-bandwidth connectivity between the ASCS and ERS instances, which is critical for the synchronous replication and heartbeat communication required for a reliable HA cluster.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Deploy ASCS and ERS in the same Availability Zone.
Why it's wrong here
Single AZ is a single point of failure.
✗
Run both ASCS and ERS on the same EC2 instance.
Why it's wrong here
Single instance is a single point of failure.
✗
Place ASCS and ERS in the same subnet.
Why it's wrong here
Subnet placement does not affect HA.
✓
Deploy ASCS and ERS in different Availability Zones.
Why this is correct
Provides AZ-level redundancy.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use a cluster placement group for ASCS and ERS instances.
Why this is correct
Low latency is required for ASCS/ERS communication.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse high availability with fault tolerance, assuming that same-AZ deployment (Option A) or same-subnet placement (Option C) is sufficient, when in fact SAP HA on AWS requires cross-AZ separation and a cluster placement group to meet the strict latency and fencing requirements.
Detailed technical explanation
How to think about this question
Under the hood, SAP Central Services HA relies on a Pacemaker cluster with Corosync for heartbeat and STONITH (fencing) to ensure only one node owns the resources at a time. The cluster placement group uses a low-latency, 10 Gbps network between instances, which is essential for the synchronous replication of the enqueue replication server (ERS) and the ASCS message server, preventing split-brain scenarios. In a real-world scenario, if the ASCS fails in one AZ, the cluster automatically promotes the ERS in the other AZ to take over, but without a placement group, network latency could cause timeouts and failover delays.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design of SAP Workloads on AWS — This question tests Design of SAP Workloads on AWS — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy ASCS and ERS in different Availability Zones. — Option D is correct because deploying ASCS and ERS in different Availability Zones (AZs) ensures that if one AZ fails, the SAP Central Services can fail over to the other AZ, maintaining high availability. This aligns with AWS best practices for SAP HANA HA, which typically uses a Pacemaker cluster across AZs with fencing and STONITH to handle failover. Option E is correct because a cluster placement group provides low-latency, high-bandwidth connectivity between the ASCS and ERS instances, which is critical for the synchronous replication and heartbeat communication required for a reliable HA cluster.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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