The correct architecture is to deploy ASCS and ERS in separate Availability Zones using AWS Launch Wizard for SAP. This is required because SAP’s high-availability model for Central Services depends on a replicated enqueue table and a Pacemaker cluster with STONITH fencing to survive an entire AZ failure; placing both instances in the same zone would create a single point of failure. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of multi-AZ resilience versus simple instance redundancy—a common trap is assuming that two instances in the same AZ provide adequate HA. Remember that ASCS and ERS must be in different AZs to protect against zone-level outages, and Launch Wizard automates the underlying ELB and EFS setup. Memory tip: “Separate zones save the enqueue”—if the zones are split, the enqueue replication survives a zone outage.
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. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An SAP environment on AWS is using a single Availability Zone. The company wants to achieve high availability for SAP Central Services (ASCS) and Enqueue Replication Server (ERS). Which architecture should they implement?
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 separate Availability Zones using AWS Launch Wizard for SAP.
Option C is correct because achieving high availability for SAP Central Services (ASCS) and Enqueue Replication Server (ERS) on AWS requires deploying them in separate Availability Zones (AZs) to protect against an entire AZ failure. AWS Launch Wizard for SAP automates the deployment of a multi-AZ SAP system, including the necessary infrastructure components like Elastic Load Balancing and Amazon EFS, ensuring that the ASCS and ERS instances are in different AZs with a replicated enqueue table. This architecture aligns with SAP's recommendation for a high-availability setup using a Pacemaker cluster with STONITH fencing, which is supported by AWS.
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 with a second instance as passive.
Why it's wrong here
Single AZ does not protect against AZ failure; HA requires multiple AZs.
✗
Place ASCS and ERS on the same instance to reduce complexity.
Why it's wrong here
Placing both on the same instance creates a single point of failure and violates best practices.
✓
Deploy ASCS and ERS in separate Availability Zones using AWS Launch Wizard for SAP.
Why this is correct
AWS Launch Wizard for SAP can deploy a multi-AZ HA architecture with automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Auto Scaling groups to automatically replace failed instances.
Why it's wrong here
Auto Scaling is for stateless tiers, not for stateful services like ASCS/ERS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume that a passive instance in the same AZ provides sufficient redundancy, overlooking that AWS defines an Availability Zone as a single failure domain, so true high availability requires separation across AZs.
Detailed technical explanation
How to think about this question
Under the hood, SAP ASCS/ERS high availability on AWS uses a Pacemaker cluster with the AWS fence agent (fence_aws) for STONITH, which requires instances in different AZs to ensure that a network partition or AZ failure does not cause a split-brain scenario. The enqueue replication between ASCS and ERS uses the SAP enqueue replication protocol (ENQ_REPL), which synchronizes lock tables in real-time; if both instances were in the same AZ, a single AZ failure would lose all locks and require manual recovery. In a real-world scenario, deploying with AWS Launch Wizard for SAP automatically configures the cluster, shared storage (e.g., Amazon EFS for /sapmnt and /usr/sap/trans), and a virtual IP using an internal Network Load Balancer, which is not possible with a single-AZ design.
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 separate Availability Zones using AWS Launch Wizard for SAP. — Option C is correct because achieving high availability for SAP Central Services (ASCS) and Enqueue Replication Server (ERS) on AWS requires deploying them in separate Availability Zones (AZs) to protect against an entire AZ failure. AWS Launch Wizard for SAP automates the deployment of a multi-AZ SAP system, including the necessary infrastructure components like Elastic Load Balancing and Amazon EFS, ensuring that the ASCS and ERS instances are in different AZs with a replicated enqueue table. This architecture aligns with SAP's recommendation for a high-availability setup using a Pacemaker cluster with STONITH fencing, which is supported by AWS.
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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