PAS-C01 Design of SAP Workloads on AWS Practice Question
An SAP Basis administrator is troubleshooting a slow-performing SAP ERP system on AWS. The system uses Amazon EBS volumes with Provisioned IOPS (PIOPS) for database storage. Which metric in Amazon CloudWatch would best indicate whether the EBS volume is experiencing a performance bottleneck?
⚠ Common exam trap
Watch out — candidates often confuse high I/O operations (VolumeReadOps) with a bottleneck, but a high read count alone does not indicate queuing or saturation—only VolumeQueueLength reveals whether the volume is struggling to keep up with the demand.
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
✓
VolumeQueueLength
VolumeQueueLength measures the number of pending I/O requests waiting to be serviced by the EBS volume. A sustained high queue length (e.g., consistently above 1 per optimized IOPS) indicates that the volume is saturated and cannot keep up with the workload, which directly causes performance bottlenecks for SAP ERP database operations. This metric is the most direct indicator of a bottleneck because it reflects backpressure from the storage subsystem.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VolumeIdleTime
Why it's wrong here
Idle time indicates when the volume is not busy, opposite of bottleneck.
- ✗
VolumeReadOps
Why it's wrong here
This shows the number of read operations, not queue depth.
- ✓
VolumeQueueLength
Why this is correct
A high queue length indicates pending I/O requests, suggesting a bottleneck.
- ✗
VolumeThroughputPercentage
Why it's wrong here
This measures throughput vs. provisioned, not queue depth.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.