PAS-C01 SAP Central Services (ASCS/ERS) Practice Question
A company is planning to deploy SAP S/4HANA on AWS with high availability. Which action should be taken to achieve high availability for the SAP Central Services (ASCS/ERS) instance?
⚠ Common exam trap
Candidates often mistakenly think that a cluster placement group (option E) can be used for cross-AZ HA, but placement groups are intra-AZ only and not suitable for SAP Central Services HA.
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 different Availability Zones.
The correct action is to deploy ASCS and ERS in different Availability Zones (Option D). This ensures that if one AZ fails, the instance can fail over to the other AZ, providing high availability. Option E (using a cluster placement group) is incorrect because cluster placement groups are confined to a single AZ and cannot span multiple AZs, making them incompatible with the cross-AZ requirement. Options A, B, and C all violate HA principles by placing both instances in the same AZ or same instance. Therefore, only Option D is a valid action for achieving high availability.
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
Incorrect: Placing ASCS and ERS in the same Availability Zone creates a single point of failure—if the AZ fails, both components are unavailable.
- ✗
Run both ASCS and ERS on the same EC2 instance.
Why it's wrong here
Incorrect: Running both ASCS and ERS on the same EC2 instance provides no redundancy; failure of that instance causes loss of SAP Central Services.
- ✗
Place ASCS and ERS in the same subnet.
Why it's wrong here
Incorrect: Since a subnet is tied to one Availability Zone, placing both in the same subnet means they are in the same AZ, lacking cross-AZ HA.
- ✓
Deploy ASCS and ERS in different Availability Zones.
Why this is correct
Correct: Deploying ASCS and ERS in different Availability Zones ensures that an AZ failure does not bring down both components, enabling failover via Pacemaker.
- ✗
Use a cluster placement group for ASCS and ERS instances.
Why it's wrong here
Incorrect: A cluster placement group is confined to a single Availability Zone and is used for low-latency grouping, not for high availability across AZs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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