The answer is to attach an EBS io2 Block Express volume to the EC2 instance. This solution provides consistent, low-latency performance because io2 Block Express delivers up to 4,000 MB/s of throughput per volume and sub-millisecond latency, specifically designed for high-performance SAP HANA workloads, and it can be attached to a running instance without any downtime. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of storage performance tuning for SAP HANA, where the common trap is confusing Elastic Fabric Adapter (EFA) with storage optimization—EFA is for HPC networking, not I/O. Remember that for SAP HANA I/O latency solutions on AWS, io2 Block Express is the only EBS volume type that guarantees both high IOPS and low latency without requiring instance reboot. A useful memory tip: "io2 for I/O, EFA for fabric"—never mix the two.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 an SAP HANA database on an EC2 instance with a single EBS volume. The database is experiencing high I/O latency during peak hours. Which solution would provide consistent, low-latency performance without downtime?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach an Elastic Fabric Adapter (EFA) to the instance to offload storage I/O.
Option C is correct because AWS Elastic Fabric Adapter (EFA) is designed for HPC and not storage. Option A (EBS io2 Block Express volumes) provides high performance and can be attached without downtime. Option B (instance store) would require data migration. Option D (EBS gp3) may not meet latency requirements.
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.
✗
Migrate the database to an instance with NVMe instance store volumes.
Why it's wrong here
Instance store is ephemeral and data would be lost on stop/termination; migration would require downtime.
✗
Replace the existing volume with an EBS io2 Block Express volume.
Why it's wrong here
This is correct, but not the best answer; io2 Block Express offers high performance but may require instance support.
✓
Attach an Elastic Fabric Adapter (EFA) to the instance to offload storage I/O.
Why this is correct
EFA is for inter-instance communication, not storage. This would not help.
Related concept
Read the scenario before looking for a memorised answer.
✗
Switch the volume type to EBS gp3 with maximum throughput.
Why it's wrong here
gp3 may still have latency issues under high load; io1 or io2 are more suitable for consistent low latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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.
What to study next
Got this wrong? Here's your next step.
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attach an Elastic Fabric Adapter (EFA) to the instance to offload storage I/O. — Option C is correct because AWS Elastic Fabric Adapter (EFA) is designed for HPC and not storage. Option A (EBS io2 Block Express volumes) provides high performance and can be attached without downtime. Option B (instance store) would require data migration. Option D (EBS gp3) may not meet latency requirements.
What should I do if I get this PAS-C01 question wrong?
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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