A big data application running on hundreds of EC2 instances needs to read and write to a shared Amazon EFS file system. The application is experiencing high latency and the CloudWatch metrics show the `PercentIOLimit` is reaching 100%. How can performance be improved?

Answer options:

Change the EFS performance mode to Max I/O.

Enable Provisioned Throughput on the EFS file system.

Migrate the data to Amazon EBS Provisioned IOPS.

Change the EFS throughput mode to Bursting.

How to approach this question

Identify the bottleneck: IOPS limit on EFS with hundreds of instances. Max I/O mode solves this.

Full Answer

A.Change the EFS performance mode to Max I/O.✓ Correct

Amazon EFS offers two performance modes: General Purpose (default) and Max I/O. Max I/O is optimized for applications where tens, hundreds, or thousands of EC2 instances access the file system concurrently. It scales to higher levels of aggregate operations per second.

Common mistakes

Confusing Throughput modes (Provisioned/Bursting) with Performance modes (General Purpose/Max I/O).

Question 48 All questions Question 50

Practice the full AWS SAA-C03 Practice Exam 3

65 questions · hints · full answers · grading

More questions from this exam

Q01A company stores sensitive documents in an Amazon S3 bucket. The security team requires that only...Easy Q02A large enterprise uses AWS Organizations to manage multiple accounts. The security team wants to...Medium Q03A company hosts a web application on Amazon EC2 instances behind an Application Load Balancer (AL...Easy Q04A company wants to continuously monitor its AWS accounts for malicious activity and unauthorized ...Medium Q05A company needs to encrypt data at rest in Amazon RDS and manage database credentials securely. T...Medium

View all 65 questions →