- 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 Practice Question: EBS gp3 is an SSD-backed general-purpose volume.
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. A key principle to apply: eBS gp3 is an SSD-backed general-purpose volume.. 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 volume that provides consistent, low-latency performance for random read/write operations, making it ideal for latency-sensitive database workloads. It offers a baseline of 3,000 IOPS and 125 MB/s throughput, with the ability to independently scale up to 16,000 IOPS and 1,000 MB/s, ensuring predictable performance without the burst-bucket limitations of gp2.
Key principle: EBS gp3 is an SSD-backed general-purpose volume.
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.
- ✓
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
EBS gp3 is an SSD-backed general-purpose volume.
- ✗
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.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'throughput optimized' (st1) with 'low-latency' because both sound performance-oriented, but st1 is designed for sequential throughput, not random I/O latency, making it a poor choice for databases.
Detailed technical explanation
How to think about this question
Under the hood, gp3 uses a non-bursting model where baseline IOPS and throughput are always available, unlike gp2 which relies on a credit-based burst bucket that can exhaust under sustained load. For a latency-sensitive database, gp3's ability to provision IOPS independently of storage size (up to 16,000 IOPS) avoids the cost and waste of over-provisioning storage just to get higher IOPS, a common pitfall with gp2. In real-world scenarios, a database like MySQL or PostgreSQL on gp3 can maintain sub-millisecond latency for random reads/writes even under heavy concurrent access, whereas HDD-based volumes would introduce seek time penalties of 5-10 ms per operation.
KKey Concepts to Remember
- EBS gp3 is an SSD-backed general-purpose volume.
- gp3 offers independent provisioning of IOPS and throughput.
- It provides consistent, low-latency performance for random I/O.
- gp3 is suitable for a broad range of transactional workloads like databases.
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
EBS gp3 is an SSD-backed general-purpose volume.
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.
Review eBS gp3 is an SSD-backed general-purpose volume., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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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 — EBS gp3 is an SSD-backed general-purpose volume..
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 volume that provides consistent, low-latency performance for random read/write operations, making it ideal for latency-sensitive database workloads. It offers a baseline of 3,000 IOPS and 125 MB/s throughput, with the ability to independently scale up to 16,000 IOPS and 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?
Review eBS gp3 is an SSD-backed general-purpose volume., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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?
EBS gp3 is an SSD-backed general-purpose volume.
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Last reviewed: Jun 11, 2026
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