- A
EBS st1 (throughput optimized HDD)
Why wrong: st1 targets throughput for workloads and is HDD-based, often with higher latency than modern general-purpose SSD. Random read/write latency consistency may not meet a strict low-latency requirement. It is usually better for larger sequential throughput needs.
- B
EBS gp3 (general purpose SSD)
gp3 is designed for a broad range of general-purpose workloads with solid low-latency performance. It supports random I/O patterns and offers predictable performance for many latency-sensitive applications. It is a common best-fit choice when you need balanced performance without specialized throughput-focused characteristics.
- C
EBS sc1 (cold HDD)
Why wrong: sc1 is intended for infrequent access and is typically not appropriate for latency-sensitive random I/O. Cold HDD volumes prioritize cost over performance. It can increase latency variance, which would hurt interactive database workloads.
- D
EBS magnetic (legacy magnetic)
Why wrong: Magnetic volumes are generally legacy and provide poor performance for random, latency-sensitive operations. They are not suitable for predictable low-latency database storage. Modern EBS SSD options like gp3 are the recommended alternative.
SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 team runs a latency-sensitive service on EC2 and needs consistent, low-latency block storage for a database. The application requires predictable performance and should be fast for random reads/writes. Which EBS volume type is the best choice?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
EBS gp3 (general purpose SSD)
B is correct because gp3 is a general-purpose SSD that provides consistent, low-latency performance for random read/write operations, making it ideal for latency-sensitive databases. It offers a baseline of 3,000 IOPS and 125 MB/s throughput, with the ability to independently scale IOPS up to 16,000 and throughput up to 1,000 MB/s, ensuring predictable performance without the burst-bucket limitations of gp2.
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.
- ✗
EBS st1 (throughput optimized HDD)
Why it's wrong here
st1 targets throughput for workloads and is HDD-based, often with higher latency than modern general-purpose SSD. Random read/write latency consistency may not meet a strict low-latency requirement. It is usually better for larger sequential throughput needs.
When this WOULD be correct
For a big data processing application that performs large, sequential reads/writes (e.g., log processing, data warehousing) and requires high throughput at low cost, st1 would be the best choice.
- ✓
EBS gp3 (general purpose SSD)
Why this is correct
gp3 is designed for a broad range of general-purpose workloads with solid low-latency performance. It supports random I/O patterns and offers predictable performance for many latency-sensitive applications. It is a common best-fit choice when you need balanced performance without specialized throughput-focused characteristics.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EBS sc1 (cold HDD)
Why it's wrong here
sc1 is intended for infrequent access and is typically not appropriate for latency-sensitive random I/O. Cold HDD volumes prioritize cost over performance. It can increase latency variance, which would hurt interactive database workloads.
When this WOULD be correct
A question asking for the most cost-effective EBS volume type for storing large amounts of infrequently accessed data, such as archival logs or backup files, where throughput is not a priority.
- ✗
EBS magnetic (legacy magnetic)
Why it's wrong here
Magnetic volumes are generally legacy and provide poor performance for random, latency-sensitive operations. They are not suitable for predictable low-latency database storage. Modern EBS SSD options like gp3 are the recommended alternative.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓EBS gp3 (general purpose SSD)Correct answer▾
Why this is correct
gp3 is designed for a broad range of general-purpose workloads with solid low-latency performance. It supports random I/O patterns and offers predictable performance for many latency-sensitive applications. It is a common best-fit choice when you need balanced performance without specialized throughput-focused characteristics.
✗EBS st1 (throughput optimized HDD)Wrong answer — click to see why▾
Why this is wrong here
EBS st1 is a throughput-optimized HDD volume designed for large, sequential workloads, not for low-latency random reads/writes required by a database.
★ When this WOULD be the correct answer
For a big data processing application that performs large, sequential reads/writes (e.g., log processing, data warehousing) and requires high throughput at low cost, st1 would be the best choice.
Why candidates choose this
Candidates may confuse 'throughput optimized' with 'low latency' or assume HDD volumes are sufficient for database workloads without considering the need for consistent, low-latency random I/O.
✗EBS sc1 (cold HDD)Wrong answer — click to see why▾
Why this is wrong here
EBS sc1 (cold HDD) is designed for infrequently accessed, cold data with low throughput requirements, not for low-latency, high-performance random reads/writes needed by a database.
★ When this WOULD be the correct answer
A question asking for the most cost-effective EBS volume type for storing large amounts of infrequently accessed data, such as archival logs or backup files, where throughput is not a priority.
Why candidates choose this
Candidates may confuse 'cold' with 'low latency' or think that any HDD can handle database workloads, overlooking the specific performance characteristics of sc1.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse throughput-optimized HDDs (st1) with low-latency needs, mistakenly thinking 'throughput' implies fast performance, when in fact HDDs are unsuitable for random I/O and latency-sensitive workloads.
Detailed technical explanation
How to think about this question
Under the hood, gp3 uses a non-bursting architecture where baseline performance is always available, unlike gp2 which relies on a credit-based burst model that can exhaust credits under sustained high I/O. For a latency-sensitive database, gp3's ability to provision IOPS independently of volume size avoids the need to over-provision storage just to achieve higher IOPS, reducing cost while maintaining consistent sub-millisecond latency. In real-world scenarios, a production MySQL or PostgreSQL database on gp3 can handle mixed OLTP workloads with predictable performance, whereas st1 or sc1 would introduce multi-second latencies due to HDD seek times.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design High-Performing Architectures — This question tests Design High-Performing Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: EBS gp3 (general purpose SSD) — B is correct because gp3 is a general-purpose SSD that provides consistent, low-latency performance for random read/write operations, making it ideal for latency-sensitive databases. It offers a baseline of 3,000 IOPS and 125 MB/s throughput, with the ability to independently scale IOPS up to 16,000 and throughput up to 1,000 MB/s, ensuring predictable performance without the burst-bucket limitations of gp2.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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