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Question 301 - SOA-C02 discussion

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A company has a cluster of Linux Amazon EC2 Spot Instances that read many files from and write many files to attached Amazon Elastic Block Store (Amazon EBS) volumes. The EC2 instances are frequently started and stopped. As part of the process when an EC2 instance starts, an EBS volume is restored from a snapshot.

EBS volumes that are restored from snapshots are experiencing initial performance that is lower than expected. The company's workload needs almost all the provisioned IOPS on the attached EBS volumes. The EC2 instances are unable to support the workload when the performance of the EBS volumes is too low. A SysOps administrator must implement a solution to ensure that the EBS volumes provide the expected performance when they are restored from snapshots.

Which solution will meet these requirements?

A.
Configure fast snapshot restore (FSR) on the snapshots that are used.
Answers
A.
Configure fast snapshot restore (FSR) on the snapshots that are used.
B.
Restore each snapshot onto an unencrypted EBS volume. Encrypt the EBS volume when the performance stabilizes.
Answers
B.
Restore each snapshot onto an unencrypted EBS volume. Encrypt the EBS volume when the performance stabilizes.
C.
Format the EBS volumes as XFS file systems before restoring the snapshots.
Answers
C.
Format the EBS volumes as XFS file systems before restoring the snapshots.
D.
Increase the Linux read-ahead buffer to 1 MiB.
Answers
D.
Increase the Linux read-ahead buffer to 1 MiB.
Suggested answer: A

Explanation:

For EBS volumes restored from snapshots to immediately achieve the required IOPS performance, Fast Snapshot Restore (FSR) can be utilized:

Enable FSR: Fast Snapshot Restore can be enabled on specific snapshots. This feature pre-warms the EBS volume created from a snapshot to its full performance level immediately after it is provisioned.

Operational Impact: By enabling FSR, any EBS volume created from these enabled snapshots will provide the provisioned IOPS performance right from the start, eliminating the performance lag that typically occurs as the data is lazily loaded from S3.

Cost Considerations: While FSR increases costs due to the pre-warming of data, it is justified by the need for immediate high performance, especially in environments where EBS volume responsiveness is critical to application performance.

This solution directly addresses the challenge of initial performance degradation and ensures that the EBS volumes can handle the required workload immediately upon restoration from a snapshot.

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asked 16/09/2024
Dinuka Darshana
45 questions
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