The answer is the Provisioned IOPS SSD EBS volume (io2). This is the correct choice because it delivers sustained low-latency persistent block storage for EC2, meeting the workload’s demand for consistent random reads and writes across the entire rendering job. Unlike instance store volumes, which are ephemeral, io2 volumes persist independently of the EC2 lifecycle, so data remains intact even when the instance is stopped and started between jobs. On the SAA-C03 exam, this scenario tests your ability to distinguish between EBS volume types and instance store, with a common trap being the assumption that gp3 offers sufficient performance for sustained high-I/O workloads—gp3 can burst but may throttle under continuous load, while io2 guarantees consistent IOPS. Remember the memory tip: “IO2 for IO that must persist and perform.”
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.
Exhibit
fio benchmark from the current volume:
- 4 KiB random read IOPS target: 22,000
- 4 KiB random write IOPS target: 18,000
- 99th percentile latency target: < 2 ms
- Current volume: gp3, 12,000 provisioned IOPS
- Observed latency during peak: 3.8-5.4 ms
- Data must remain attached to one EC2 instance and persist after stop/start
Based on the exhibit, a media rendering job runs on a single EC2 instance and writes a large working set of metadata to block storage. The workload performs sustained random reads and writes and must keep latency consistently low for the entire run. The instance may be stopped and started between jobs, and the data must persist. Which storage choice best meets the requirements?
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.
fio benchmark from the current volume:
- 4 KiB random read IOPS target: 22,000
- 4 KiB random write IOPS target: 18,000
- 99th percentile latency target: < 2 ms
- Current volume: gp3, 12,000 provisioned IOPS
- Observed latency during peak: 3.8-5.4 ms
- Data must remain attached to one EC2 instance and persist after stop/start
A
Amazon S3 with multipart uploads because it provides durable object storage and high throughput.
Why wrong: S3 is object storage, not block storage, and it cannot serve the low-latency random I/O pattern shown in the benchmark.
B
Amazon EFS because it can be mounted by EC2 and supports persistent file access.
Why wrong: EFS is shared file storage, but it generally has higher latency than provisioned block storage for this single-instance random I/O workload.
C
Provisioned IOPS SSD EBS volume (io2).
io2 is designed for sustained high IOPS with low and consistent latency on EC2 block storage. The workload is single-instance, random I/O intensive, and needs persistence across stop/start, which matches EBS block storage behavior well.
D
Amazon FSx for Windows File Server because it offers durable storage and low latency.
Why wrong: FSx for Windows File Server is a managed file system for Windows-based use cases, not the best fit for a single Linux EC2 block-storage workload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Provisioned IOPS SSD EBS volume (io2).
The workload requires sustained low-latency random reads and writes to block storage, and the data must persist across instance stop/start cycles. Provisioned IOPS SSD EBS volumes (io2) are block-level storage designed for high-performance, low-latency workloads with consistent IOPS, and they persist independently of the EC2 instance lifecycle.
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.
✗
Amazon S3 with multipart uploads because it provides durable object storage and high throughput.
Why it's wrong here
S3 is object storage, not block storage, and it cannot serve the low-latency random I/O pattern shown in the benchmark.
✗
Amazon EFS because it can be mounted by EC2 and supports persistent file access.
Why it's wrong here
EFS is shared file storage, but it generally has higher latency than provisioned block storage for this single-instance random I/O workload.
✓
Provisioned IOPS SSD EBS volume (io2).
Why this is correct
io2 is designed for sustained high IOPS with low and consistent latency on EC2 block storage. The workload is single-instance, random I/O intensive, and needs persistence across stop/start, which matches EBS block storage behavior well.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon FSx for Windows File Server because it offers durable storage and low latency.
Why it's wrong here
FSx for Windows File Server is a managed file system for Windows-based use cases, not the best fit for a single Linux EC2 block-storage workload.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse file storage (EFS, FSx) or object storage (S3) with block storage, failing to recognize that sustained low-latency random reads and writes require a block-level device like EBS, not a network-mounted file system.
Trap categories for this question
Command / output trap
S3 is object storage, not block storage, and it cannot serve the low-latency random I/O pattern shown in the benchmark.
Detailed technical explanation
How to think about this question
EBS io2 volumes use a single-digit millisecond latency profile and can deliver up to 256,000 IOPS per volume with a 64 KiB I/O size, making them ideal for sustained random workloads. Unlike instance store volumes, EBS volumes persist independently of the EC2 instance lifecycle, so data remains intact when the instance is stopped and started. The io2 volume type also offers 99.999% durability, which is critical for persistent metadata.
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.
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: Provisioned IOPS SSD EBS volume (io2). — The workload requires sustained low-latency random reads and writes to block storage, and the data must persist across instance stop/start cycles. Provisioned IOPS SSD EBS volumes (io2) are block-level storage designed for high-performance, low-latency workloads with consistent IOPS, and they persist independently of the EC2 instance lifecycle.
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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