- A
Keep using EBS, but attach the same EBS volume to tasks in multiple Availability Zones using EBS multi-attach so all tasks share the filesystem.
Why wrong: EBS volumes are tied to a specific Availability Zone. Even though multi-attach can allow multiple EC2 instances to attach the same EBS volume concurrently (within constraints), it does not create a cross-AZ shared filesystem. Additionally, EBS multi-attach does not provide an NFS-like shared filesystem semantics for concurrent access from tasks as described.
- B
Use Amazon EFS with mount targets in each Availability Zone so all tasks mount a common NFS filesystem over the AWS network.
EFS is designed for shared, NFS-like file storage that can be mounted concurrently from compute resources across multiple Availability Zones. By creating mount targets in each AZ used by the ECS tasks, you enable low-latency network access patterns so tasks can read and write the same shared filesystem reliably.
- C
Use Amazon S3 for the intermediate artifacts and rely on S3 event notifications to emulate POSIX file operations.
Why wrong: S3 is object storage, not a POSIX-style shared filesystem. Even with event notifications, S3 does not provide the same semantics as mounting a directory and performing frequent low-latency reads/writes as tasks stream artifacts to each other.
- D
Switch to instance store on each task and use SQS messages between tasks to copy intermediate artifacts.
Why wrong: Instance store is ephemeral and not intended for shared, persistent intermediate artifacts across tasks. SQS is a messaging/coordination layer and does not provide filesystem access, so this approach adds copy/serialization overhead and does not meet the shared low-latency filesystem requirement.
Quick Answer
The answer is Amazon EFS with mount targets in each Availability Zone, because it provides a fully managed, shared filesystem for ECS tasks across AZs that supports concurrent, low-latency reads and writes from multiple tasks. Unlike EBS volumes, which are locked to a single AZ and cannot be shared across zones, EFS offers a POSIX-compliant NFS filesystem that all tasks can mount simultaneously, enabling seamless streaming of intermediate artifacts between tasks regardless of their AZ. On the SAA-C03 exam, this scenario tests your understanding of shared vs. block storage: a common trap is choosing EBS Multi-Attach, but that only works within a single AZ and for a limited number of instances, not for ECS tasks across zones. Remember the key distinction: EBS is AZ-scoped block storage, while EFS is region-scoped shared filesystem. Memory tip: “EFS for Every Filesystem Share” — if tasks across AZs need to share files, think EFS, not EBS.
SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 media processing service runs ECS tasks in multiple Availability Zones. Each task must read and write the same shared filesystem with low latency because tasks stream intermediate artifacts to other tasks. The team currently mounts an EBS volume per task, and cross-AZ tasks frequently cannot see each other’s files. Which option best resolves the shared filesystem requirement while supporting high-performing access?
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
Use Amazon EFS with mount targets in each Availability Zone so all tasks mount a common NFS filesystem over the AWS network.
Amazon EFS provides a fully managed, shared NFS filesystem that can be mounted concurrently by ECS tasks across multiple Availability Zones with low latency. It supports POSIX file operations, making it ideal for streaming intermediate artifacts between tasks. EFS mount targets in each AZ ensure local access, meeting the requirement for high-performing shared storage.
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.
- ✗
Keep using EBS, but attach the same EBS volume to tasks in multiple Availability Zones using EBS multi-attach so all tasks share the filesystem.
Why it's wrong here
EBS volumes are tied to a specific Availability Zone. Even though multi-attach can allow multiple EC2 instances to attach the same EBS volume concurrently (within constraints), it does not create a cross-AZ shared filesystem. Additionally, EBS multi-attach does not provide an NFS-like shared filesystem semantics for concurrent access from tasks as described.
- ✓
Use Amazon EFS with mount targets in each Availability Zone so all tasks mount a common NFS filesystem over the AWS network.
Why this is correct
EFS is designed for shared, NFS-like file storage that can be mounted concurrently from compute resources across multiple Availability Zones. By creating mount targets in each AZ used by the ECS tasks, you enable low-latency network access patterns so tasks can read and write the same shared filesystem reliably.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Amazon S3 for the intermediate artifacts and rely on S3 event notifications to emulate POSIX file operations.
Why it's wrong here
S3 is object storage, not a POSIX-style shared filesystem. Even with event notifications, S3 does not provide the same semantics as mounting a directory and performing frequent low-latency reads/writes as tasks stream artifacts to each other.
- ✗
Switch to instance store on each task and use SQS messages between tasks to copy intermediate artifacts.
Why it's wrong here
Instance store is ephemeral and not intended for shared, persistent intermediate artifacts across tasks. SQS is a messaging/coordination layer and does not provide filesystem access, so this approach adds copy/serialization overhead and does not meet the shared low-latency filesystem requirement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume EBS multi-attach works across Availability Zones, but it is strictly limited to a single AZ and requires specific instance types, making it unsuitable for multi-AZ shared filesystem requirements.
Detailed technical explanation
How to think about this question
EFS uses the NFSv4.1 protocol and provides strong consistency for reads and writes after a successful write operation. Under the hood, EFS distributes data across multiple AZs within a region, and mount targets in each AZ route traffic to the same file system via a private IP, enabling concurrent access from tasks in different AZs. In real-world media processing, this allows tasks to stream large intermediate video segments with sub-millisecond latency, avoiding the overhead of copying data between tasks.
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.
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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: Use Amazon EFS with mount targets in each Availability Zone so all tasks mount a common NFS filesystem over the AWS network. — Amazon EFS provides a fully managed, shared NFS filesystem that can be mounted concurrently by ECS tasks across multiple Availability Zones with low latency. It supports POSIX file operations, making it ideal for streaming intermediate artifacts between tasks. EFS mount targets in each AZ ensure local access, meeting the requirement for high-performing shared storage.
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
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.
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