- A
A shared file system (e.g., Amazon EFS) to store the SAP transport directory and global profile.
ASCS and ERS require shared storage for transport directory.
- B
An Application Load Balancer to distribute traffic between ASCS and ERS instances.
Why wrong: ASCS and ERS use a virtual IP, not a load balancer.
- C
A floating IP address (using Elastic IP or Route 53 health checks) to manage the ASCS virtual hostname.
A virtual IP is required for ASCS failover.
- D
A read replica of the SAP HANA database to offload application traffic.
Why wrong: Read replicas are for databases, not for ASCS/ERS.
- E
A secondary Windows Server Failover Cluster in a different Availability Zone.
Why wrong: Linux Pacemaker is typically used on AWS for SAP HA.
Question 1,666 of 1,733
SAP Central Services (ASCS/ERS) High Availability — Shared File System and Floating IP | AWS SAP on AWS Specialty Explained
This PAS-C01 practice question tests your understanding of design of sap workloads on aws. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 migrating its SAP NetWeaver system to AWS and wants to implement a high-availability architecture for the SAP Central Services (ASCS) and Enqueue Replication Server (ERS). Which TWO of the following are required components in a recommended AWS HA setup for ASCS and ERS?
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
✓
A shared file system (e.g., Amazon EFS) to store the SAP transport directory and global profile.
Option A is correct because in an SAP NetWeaver high-availability architecture on AWS, a shared file system such as Amazon EFS is required to store the SAP transport directory and global profile. This ensures that both the ASCS and ERS instances can access consistent configuration and transport files, which is essential for failover and cluster operations. Without a shared file system, the instances would have divergent configurations, breaking the HA setup.
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.
- ✓
A shared file system (e.g., Amazon EFS) to store the SAP transport directory and global profile.
Why this is correct
ASCS and ERS require shared storage for transport directory.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An Application Load Balancer to distribute traffic between ASCS and ERS instances.
Why it's wrong here
ASCS and ERS use a virtual IP, not a load balancer.
- ✓
A floating IP address (using Elastic IP or Route 53 health checks) to manage the ASCS virtual hostname.
Why this is correct
A virtual IP is required for ASCS failover.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A read replica of the SAP HANA database to offload application traffic.
Why it's wrong here
Read replicas are for databases, not for ASCS/ERS.
- ✗
A secondary Windows Server Failover Cluster in a different Availability Zone.
Why it's wrong here
Linux Pacemaker is typically used on AWS for SAP HA.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the need for a load balancer (Option B) with the floating IP mechanism, not realizing that SAP ASCS/ERS uses a virtual IP for active/passive failover rather than distributing traffic across multiple active instances.
Detailed technical explanation
How to think about this question
The floating IP address (Option C) is implemented using an Elastic IP that is reassigned via AWS API calls or Route 53 health checks with failover routing, allowing the ASCS virtual hostname to follow the active node. Under the hood, the SAP enqueue replication protocol (used by ERS) relies on this virtual IP to ensure that the enqueue server can be reached consistently after a failover, avoiding the need for application-level reconfiguration. In a real-world scenario, if the shared file system (EFS) is not used, the transport directory would be out of sync, causing import errors during system copies or upgrades.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
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: A shared file system (e.g., Amazon EFS) to store the SAP transport directory and global profile. — Option A is correct because in an SAP NetWeaver high-availability architecture on AWS, a shared file system such as Amazon EFS is required to store the SAP transport directory and global profile. This ensures that both the ASCS and ERS instances can access consistent configuration and transport files, which is essential for failover and cluster operations. Without a shared file system, the instances would have divergent configurations, breaking the HA setup.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
8 more ways this is tested on PAS-C01
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) and Enqueue Replication Server (ERS). Which AWS services can be used to implement a failover cluster for ASCS and ERS? (Select THREE.)
medium- A.AWS CloudTrail
- ✓ B.Elastic Load Balancing
- ✓ C.Amazon Route 53
- D.AWS Config
- ✓ E.Custom scripts to manage floating IP and start/stop services
Why B: Elastic Load Balancing (ELB) is correct because it can be used in conjunction with a Network Load Balancer (NLB) to provide a stable endpoint for SAP ASCS and ERS failover. The NLB supports static IP addresses and can be configured with health checks that monitor the SAP service, automatically routing traffic to the healthy node in the cluster. This eliminates the need for a traditional floating IP and integrates with AWS-native failover mechanisms.
Variation 2. A company is running SAP HANA on AWS and needs to ensure high availability for the SAP Central Services (ASCS/ERS) instance. Which TWO actions should be taken to achieve this? (Choose two.)
medium- ✓ A.Configure ASCS and ERS on separate EC2 instances in different Availability Zones.
- B.Use an Application Load Balancer to distribute traffic between ASCS and ERS instances.
- ✓ C.Use a Network Load Balancer with a floating IP address for the SAP virtual hostname.
- D.Deploy both ASCS and ERS on the same EC2 instance to reduce latency.
- E.Place both ASCS and ERS in the same Availability Zone to minimize network latency.
Why A: Option A is correct because SAP Central Services (ASCS/ERS) must run on separate EC2 instances to avoid a single point of failure. Placing them in different Availability Zones (AZs) ensures that if one AZ fails, the other instance can take over, providing high availability. This aligns with SAP's recommendation for a multi-AZ architecture for ASCS/ERS in an SAP HANA on AWS environment.
Variation 3. A company is running SAP on AWS and wants to ensure high availability for SAP Central Services (ASCS) and Enqueue Replication Server (ERS). Which architecture meets this requirement?
medium- A.Deploy ASCS and ERS on the same EC2 instance with S3 replication.
- B.Configure Route 53 health checks to switch between two instances in the same AZ.
- ✓ C.Deploy ASCS and ERS on separate EC2 instances in different Availability Zones, with a Network Load Balancer.
- D.Use a single EC2 instance with an S3 bucket for shared storage and Lambda for failover.
Why C: Option C is correct because SAP Central Services (ASCS) and Enqueue Replication Server (ERS) must run on separate EC2 instances in different Availability Zones to achieve high availability. A Network Load Balancer (NLB) is used to distribute traffic and provide a single endpoint, while the enqueue replication mechanism (enrep) synchronizes the lock table between the two instances, enabling automatic failover without data loss.
Variation 4. A company is running SAP ERP on AWS and wants to ensure high availability for the SAP Central Services (ASCS) instance. Which AWS service should be used to achieve this?
medium- A.EC2 Auto Scaling
- ✓ B.Elastic Load Balancer (NLB)
- C.Amazon Route 53
- D.AWS Global Accelerator
Why B: For SAP ASCS high availability, AWS recommends using a Network Load Balancer (NLB) to manage the virtual IP address (VIP) required by SAP. The NLB handles the failover of the ASCS instance between two EC2 nodes by directing traffic to the active node, ensuring seamless client connectivity without relying on a floating IP or custom scripts.
Variation 5. A company runs SAP on AWS and wants to implement a high-availability (HA) solution for SAP Central Services (ASCS/ERS) using Amazon EC2 instances. Which AWS service is essential for managing the virtual IP address (VIP) required for the HA cluster?
medium- A.AWS Global Accelerator
- ✓ B.Amazon Route 53
- C.AWS WAF
- D.Application Load Balancer
Why B: Amazon Route 53 is essential for managing the virtual IP address (VIP) required for the SAP Central Services (ASCS/ERS) HA cluster because it provides DNS-based failover. When the active ASCS instance fails, the HA cluster updates a Route 53 DNS record to point to the standby instance's IP address, effectively migrating the VIP. This allows clients to reconnect using the same DNS name without needing an elastic IP or a network-level VIP, which is not natively supported in AWS for this use case.
Variation 6. A company is migrating its SAP ERP system to AWS. The system requires high availability for the SAP Central Services (ASCS) instance. Which AWS architecture should be used to meet this requirement?
medium- ✓ A.Use a multi-AZ deployment with Amazon FSx for NetApp ONTAP as a shared file system and place ASCS on two EC2 instances in different Availability Zones with an Elastic IP address.
- B.Use Amazon S3 to store the ASCS configuration and launch a single EC2 instance with an Auto Scaling group.
- C.Deploy ASCS on a single EC2 instance in one Availability Zone with an EBS volume snapshot for recovery.
- D.Use Amazon RDS for SAP Central Services running in a Multi-AZ configuration.
Why A: Option A is correct because SAP ASCS requires a highly available shared file system and a floating IP address for failover. Amazon FSx for NetApp ONTAP provides a highly available, NFS-based shared file system that supports the SAP transport and profile directories across Availability Zones. Placing two EC2 instances in different AZs with an Elastic IP address allows the ASCS instance to be failed over manually or via a cluster manager, meeting the high availability requirement.
Variation 7. A company is migrating its SAP ERP system to AWS. The system requires high availability for the SAP central services (ASCS) and must support automatic failover. Which AWS architecture should the company use to meet these requirements?
medium- A.Configure a Network Load Balancer in front of two ASCS instances in different Availability Zones.
- B.Use Amazon RDS Multi-AZ to host the SAP central services.
- ✓ C.Deploy ASCS on an EC2 instance in an Auto Scaling group with a lifecycle hook that triggers a Lambda function to reattach the ASCS cluster resources.
- D.Run ASCS on a single EC2 instance in a single Availability Zone with an Elastic IP address.
Why C: Option C is correct because it describes a pattern for achieving automatic failover of SAP ASCS using an Auto Scaling group with a lifecycle hook. When the ASCS instance fails, the Auto Scaling group launches a new instance, and the lifecycle hook triggers a Lambda function that reattaches the cluster resources (e.g., EIP, EBS volumes, or shared file systems) to the new instance, enabling the SAP ENSA2 or ENSA1 cluster to resume operations without manual intervention.
Variation 8. A company is migrating its SAP ERP system to AWS. They need to ensure high availability for the SAP Central Services (ASCS) instance. Which AWS architecture should they implement?
medium- ✓ A.Configure a two-node cluster with a virtual IP (VIP) using AWS Route 53 health checks and failover
- B.Run ASCS on Amazon RDS for SAP with Multi-AZ
- C.Deploy ASCS on a single large EC2 instance
- D.Use an Auto Scaling group with a minimum of 2 instances
Why A: Option A is correct because SAP ASCS requires a highly available cluster with a virtual IP (VIP) that can fail over between two EC2 instances. AWS Route 53 health checks can monitor the VIP and update DNS records to redirect traffic to the standby node upon failure, providing the necessary high availability for the ASCS instance without relying on a single point of failure.
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Last reviewed: Jun 11, 2026
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