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Design of SAP Workloads on AWS →hardMultiple ChoiceObjective-mapped

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 runs its SAP ERP system on AWS with an Oracle database on an EC2 instance. The system is used by thousands of users globally. Recently, the database has been experiencing slow query performance, especially during end-of-month processing. The administrator notices that the database instance is an r5.8xlarge with 32 vCPUs and 256 GB of memory, running on a single EBS io1 volume with 20,000 IOPS for the data files. The administrator has already optimized the SQL queries and increased the SGA size. However, performance remains poor. The Amazon CloudWatch metrics show that the EBS volume's Average Queue Length is consistently above 10 and the read latency spikes to over 100 ms during peak times. The CPU utilization is around 70%. Which action should the administrator take to resolve the I/O bottleneck?

A
Change the volume type to gp3 and increase the baseline IOPS.
Why wrong: Changing to gp3 may not provide sufficient IOPS for this high-I/O workload; io1 is still suitable with multiple volumes.
B
Create multiple EBS io1 volumes and stripe them using RAID 0 at the OS level.
Correct. RAID 0 striping increases parallelism, distributing I/O across volumes to reduce queue depth and latency.
C
Increase the IOPS of the existing io1 volume to 40,000.
Why wrong: Increasing IOPS on a single volume may not help if the volume is already at its throughput limit. The queue length indicates the volume's queuing behavior, not just IOPS.
D
Upgrade the EC2 instance to an r5.12xlarge with more network bandwidth.
Why wrong: Upgrading instance type does not directly address the storage I/O bottleneck; the issue is at the EBS level.

Full breakdown with real-world context →

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

✓

Create multiple EBS io1 volumes and stripe them using RAID 0 at the OS level.

Option B is correct because striping multiple EBS io1 volumes using RAID 0 at the OS level increases I/O parallelism, distributing the workload across multiple volumes and reducing the average queue length and latency. Option A is incorrect because gp3 volumes may not provide sufficient IOPS for this demanding workload, and a single volume still creates a bottleneck. Option C is incorrect because increasing IOPS on a single volume may not resolve the queue length issue if the volume is already at its throughput limit. Option D is incorrect because upgrading the instance does not directly improve EBS performance; the bottleneck is at the storage layer.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Change the volume type to gp3 and increase the baseline IOPS.
Why it's wrong here
Changing to gp3 may not provide sufficient IOPS for this high-I/O workload; io1 is still suitable with multiple volumes.
✓
Create multiple EBS io1 volumes and stripe them using RAID 0 at the OS level.
Why this is correct
Correct. RAID 0 striping increases parallelism, distributing I/O across volumes to reduce queue depth and latency.
Related concept
Standard ACLs match source addresses.
✗
Increase the IOPS of the existing io1 volume to 40,000.
Why it's wrong here
Increasing IOPS on a single volume may not help if the volume is already at its throughput limit. The queue length indicates the volume's queuing behavior, not just IOPS.
✗
Upgrade the EC2 instance to an r5.12xlarge with more network bandwidth.
Why it's wrong here
Upgrading instance type does not directly address the storage I/O bottleneck; the issue is at the EBS level.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

Visual reference

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.

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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 — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Create multiple EBS io1 volumes and stripe them using RAID 0 at the OS level. — Option B is correct because striping multiple EBS io1 volumes using RAID 0 at the OS level increases I/O parallelism, distributing the workload across multiple volumes and reducing the average queue length and latency. Option A is incorrect because gp3 volumes may not provide sufficient IOPS for this demanding workload, and a single volume still creates a bottleneck. Option C is incorrect because increasing IOPS on a single volume may not resolve the queue length issue if the volume is already at its throughput limit. Option D is incorrect because upgrading the instance does not directly improve EBS performance; the bottleneck is at the storage layer.

What should I do if I get this PAS-C01 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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