- A
Enable Fast Snapshot Restore (FSR) on the snapshot in the target Availability Zone before creating the replacement volume
FSR fully initializes the volume's block index immediately upon creation. The first I/O to any block is served from EBS at full throughput rather than waiting for lazy initialization from S3. For a 2 TB database volume where I/O latency determines restore time, FSR eliminates the 2-hour performance degradation period entirely.
- B
Use a Provisioned IOPS (io2) volume type instead of gp3 to get higher IOPS during initialization
Why wrong: Provisioned IOPS affects the maximum IOPS ceiling of a volume, but lazy initialization still applies regardless of volume type. Until blocks are touched for the first time and loaded from S3, even an io2 volume will experience the same initialization latency per uninitialized block.
- C
Run a full dd or fio pre-warm pass over the volume after attaching it but before starting the database
Why wrong: A sequential read pass (dd if=/dev/xvdf of=/dev/null) forces all blocks to be read from S3 and initialized in the EBS layer, which effectively pre-warms the volume. This is the manual alternative to FSR and adds hours of pre-warm time before the database can start — the downtime is traded for warm disk performance.
- D
Increase the EBS volume size to 4 TB when restoring from the snapshot to get double the throughput baseline
Why wrong: For gp3, throughput and IOPS are configured independently of volume size (unlike gp2). Doubling the volume size does not affect lazy initialization. Each block on the larger volume still initializes lazily on first access.
How to Eliminate Slow EBS Snapshot Restore Performance Using Fast Snapshot Restore
This SOA-C02 practice question tests your understanding of reliability and business continuity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: eBS snapshot restoration. 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.
An EC2 instance runs a database on a 2 TB EBS gp3 volume. After a corruption event, the team must restore from a snapshot. When they detach the corrupted volume, attach a new volume restored from the snapshot, and start the database, performance is 10 to 20 times lower than normal for the first two hours. What causes this behavior, and what feature eliminates it?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
Enable Fast Snapshot Restore (FSR) on the snapshot in the target Availability Zone before creating the replacement volume
When you create an EBS volume from a snapshot, the volume's data blocks are lazily loaded from Amazon S3 on first access. This causes high latency and low IOPS until all blocks are fetched. Fast Snapshot Restore (FSR) pre-initializes the volume in a specific Availability Zone, eliminating the need for lazy loading and providing full performance immediately.
Key principle: EBS snapshot restoration
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable Fast Snapshot Restore (FSR) on the snapshot in the target Availability Zone before creating the replacement volume
Why this is correct
FSR fully initializes the volume's block index immediately upon creation. The first I/O to any block is served from EBS at full throughput rather than waiting for lazy initialization from S3. For a 2 TB database volume where I/O latency determines restore time, FSR eliminates the 2-hour performance degradation period entirely.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
EBS snapshot restoration
- ✗
Use a Provisioned IOPS (io2) volume type instead of gp3 to get higher IOPS during initialization
Why it's wrong here
Provisioned IOPS affects the maximum IOPS ceiling of a volume, but lazy initialization still applies regardless of volume type. Until blocks are touched for the first time and loaded from S3, even an io2 volume will experience the same initialization latency per uninitialized block.
- ✗
Run a full dd or fio pre-warm pass over the volume after attaching it but before starting the database
Why it's wrong here
A sequential read pass (dd if=/dev/xvdf of=/dev/null) forces all blocks to be read from S3 and initialized in the EBS layer, which effectively pre-warms the volume. This is the manual alternative to FSR and adds hours of pre-warm time before the database can start — the downtime is traded for warm disk performance.
- ✗
Increase the EBS volume size to 4 TB when restoring from the snapshot to get double the throughput baseline
Why it's wrong here
For gp3, throughput and IOPS are configured independently of volume size (unlike gp2). Doubling the volume size does not affect lazy initialization. Each block on the larger volume still initializes lazily on first access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume performance issues are due to volume type (gp3 vs io2) or size, rather than recognizing the fundamental lazy-load initialization behavior of EBS snapshots and the specific feature (FSR) designed to mitigate it.
Detailed technical explanation
How to think about this question
EBS volumes restored from snapshots use a 'lazy loading' mechanism where data is fetched from S3 in 1 MiB chunks on first read. This means the first read to a block can take 10–50 ms instead of the sub-millisecond latency of a fully initialized volume. Fast Snapshot Restore (FSR) pre-fetches all blocks into the volume's storage in the target Availability Zone, ensuring that the volume behaves as if it were freshly created with no performance penalty. FSR is billed per snapshot per Availability Zone and is ideal for critical databases that must be restored quickly.
KKey Concepts to Remember
- EBS snapshot restoration
- Fast Snapshot Restore
- EBS initialization
- lazy loading from S3
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 snapshot restoration
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review eBS snapshot restoration, then practise related SOA-C02 questions on the same topic to reinforce the concept.
- →
Reliability and Business Continuity — study guide chapter
Learn the concepts, then practise the questions
- →
Reliability and Business Continuity practice questions
Targeted practice on this topic area only
- →
All SOA-C02 questions
1,546 questions across all exam domains
- →
AWS Certified SysOps Administrator Associate SOA-C02 study guide
Full concept coverage aligned to exam objectives
- →
SOA-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related SOA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Monitoring, Logging, and Remediation practice questions
Practise SOA-C02 questions linked to Monitoring, Logging, and Remediation.
Reliability and Business Continuity practice questions
Practise SOA-C02 questions linked to Reliability and Business Continuity.
Deployment, Provisioning, and Automation practice questions
Practise SOA-C02 questions linked to Deployment, Provisioning, and Automation.
Security and Compliance practice questions
Practise SOA-C02 questions linked to Security and Compliance.
Networking and Content Delivery practice questions
Practise SOA-C02 questions linked to Networking and Content Delivery.
Cost and Performance Optimization practice questions
Practise SOA-C02 questions linked to Cost and Performance Optimization.
SOA-C02 fundamentals practice questions
Practise SOA-C02 questions linked to SOA-C02 fundamentals.
SOA-C02 scenario practice questions
Practise SOA-C02 questions linked to SOA-C02 scenario.
SOA-C02 troubleshooting practice questions
Practise SOA-C02 questions linked to SOA-C02 troubleshooting.
Practice this exam
Start a free SOA-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — EBS snapshot restoration.
What is the correct answer to this question?
The correct answer is: Enable Fast Snapshot Restore (FSR) on the snapshot in the target Availability Zone before creating the replacement volume — When you create an EBS volume from a snapshot, the volume's data blocks are lazily loaded from Amazon S3 on first access. This causes high latency and low IOPS until all blocks are fetched. Fast Snapshot Restore (FSR) pre-initializes the volume in a specific Availability Zone, eliminating the need for lazy loading and providing full performance immediately.
What should I do if I get this SOA-C02 question wrong?
Review eBS snapshot restoration, then practise related SOA-C02 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
EBS snapshot restoration
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More SOA-C02 practice questions
- A company uses an Amazon DynamoDB table with on-demand capacity mode. The table handles a workload with a steady baselin…
- A company uses Amazon CloudWatch Logs to store application logs. The SysOps administrator needs to count the occurrences…
- A SysOps administrator needs to monitor the CPU utilization of an Amazon EC2 instance and send an alert when it exceeds…
- A SysOps administrator needs to monitor the CPU utilization of an Amazon EC2 instance fleet and send an alert when the a…
- A company's security policy requires that all Amazon S3 buckets must have server-side encryption enabled. The SysOps adm…
- A SysOps administrator uses AWS CloudFormation to deploy a stack that includes an Amazon EC2 instance. The administrator…
Last reviewed: Jun 11, 2026
This SOA-C02 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 SOA-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.