SAA-C03 Design High-Performing Architectures Practice Question
An application requires extremely high I/O performance for temporary data processing that can be lost if the instance fails. The architect is considering using EC2 Instance Store. Which TWO statements correctly describe the performance and characteristics of Instance Store volumes?
⚠ Common exam trap
Candidates mistakenly believe Instance Store is persistent. Because it is ephemeral, any data stored there is lost if the instance is stopped or terminated, which is a critical design risk.
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
✓
Instance store provides higher I/O performance compared to EBS.
EC2 Instance Store provides high-performance, local block-level storage that is physically attached to the host computer. This makes it ideal for temporary storage of information that changes frequently, such as buffers, caches, and scratch space. Architects must account for its ephemeral nature while leveraging its superior I/O capabilities for high-performance workloads.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Data is preserved when the instance is stopped and started.
Why it's wrong here
Data in an instance store volume is lost when the instance is stopped, terminated, or if the underlying hardware fails. This ephemeral nature is a key distinction from EBS, which persists data independently of the instance's lifecycle, necessitating a different strategy for data durability.
- ✓
Instance store provides higher I/O performance compared to EBS.
Why this is correct
Because instance store volumes are physically attached to the host hardware, they avoid the network latency associated with EBS. This results in very high IOPS and low latency, making them perfect for high-performance computing tasks that require rapid access to temporary datasets.
- ✗
Volumes can be detached and reattached to different instances.
Why it's wrong here
Unlike EBS volumes, which are network-attached and can be moved between instances, instance store volumes are fixed to a specific host. They cannot be detached or moved, which limits their flexibility but contributes to their superior local I/O performance characteristics.
- ✓
Instance store is ideal for swap space and temp databases.
Why this is correct
The high speed and low cost of instance store make it the best choice for swap files, temporary tables, and caching layers where data loss is acceptable or handled by the application. This offloads I/O from persistent storage, improving overall system performance.
- ✗
Storage capacity can be increased without stopping the instance.
Why it's wrong here
The size of the instance store is determined by the EC2 instance type and cannot be modified. If more instance store capacity is needed, the application must be migrated to a larger instance type, whereas EBS volumes allow for dynamic resizing via Elastic Volumes.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.