SAA-C03 Design High-Performing Architectures Practice Question
A media processing pipeline uses EBS-backed storage for an application that performs sustained random I/O with low latency requirements. During peak processing windows, the team sees increased read latency and occasional timeouts at the application layer. They need predictable, high IOPS performance rather than best-effort throughput. Which EBS configuration choice is most appropriate?
⚠ Common exam trap
Test-takers frequently choose gp2 (Option A) assuming burst credits will cover peak loads, but they fail to recognize that sustained peak I/O exhausts credits, leading to performance degradation, whereas provisioned IOPS volumes guarantee consistent performance regardless of duration.
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
✓
Use io1 or io2 EBS volumes configured with a high provisioned IOPS value, and attach them to EBS-optimized instances.
Io1 and io2 volumes are provisioned IOPS SSD volumes designed for sustained, predictable high IOPS performance, which directly addresses the application's need for low-latency random I/O during peak loads. Attaching them to EBS-optimized instances ensures dedicated network bandwidth for EBS traffic, eliminating contention and preventing timeouts.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use gp2 volumes and rely on burst credits to handle peak random I/O latency requirements.
Why it's wrong here
gp2 provides baseline IOPS proportional to volume size and can use burst credits for temporary performance. Under sustained random I/O at high load, burst behavior is not sufficient to guarantee consistent, low-latency IOPS delivery, so latency can still increase when burst capacity is exhausted.
- ✓
Use io1 or io2 EBS volumes configured with a high provisioned IOPS value, and attach them to EBS-optimized instances.
Why this is correct
io1/io2 are designed for predictable, low-latency IOPS for sustained I/O workloads. By provisioning a sufficient IOPS level, you improve consistency during peak windows. Using EBS-optimized instances ensures the instance-to-EBS bandwidth and I/O performance are adequate so the instance does not become the bottleneck before EBS can deliver the provisioned IOPS.
- ✗
Use standard HDD (st1) volumes, because they provide high throughput and will reduce latency automatically.
Why it's wrong here
st1 is intended for throughput-oriented HDD workloads and can deliver higher throughput per volume, but it is not optimized for low-latency, sustained random I/O. For random, latency-sensitive access patterns, st1 typically does not provide the consistent latency associated with provisioned IOPS (io1/io2).
- ✗
Use S3 instead of EBS for random I/O latency reduction without changing the application.
Why it's wrong here
S3 is object storage and is not a drop-in replacement for block storage random I/O patterns without architectural changes. Without redesign (for example, buffering, caching layers, or different I/O access patterns), substituting S3 for EBS is unlikely to satisfy low-latency random I/O requirements.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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