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

Change the EFS performance mode to Max I/O.

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).

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