PAS-C01 Design of SAP Workloads on AWS Practice Question
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?
⚠ Common exam trap
It's easy for candidates to 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.
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 ASCS and ERS in separate Availability Zones using AWS Launch Wizard for SAP.
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.
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.
- ✗
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.
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