A big data application runs on hundreds of EC2 instances and reads data from a shared Amazon EFS file system. The application is experiencing high latency. CloudWatch metrics show that the PercentIOLimit metric is frequently hitting 100%.<br/><br/>Which TWO actions should a solutions architect take to improve performance? (Select TWO.)

Answer options:

Change the EFS performance mode to Max I/O.

Change the EFS performance mode to General Purpose.

Enable EFS Intelligent-Tiering.

Ensure the application is highly parallelized.

Switch the file system to EFS One Zone.

How to approach this question

Identify the EFS performance mode designed for big data and high IOPS.

Full Answer

If the PercentIOLimit metric is hitting 100%, the file system is maxing out the IOPS available in General Purpose mode. You should migrate to a file system using Max I/O mode, which scales to higher levels of aggregate throughput and IOPS. Max I/O requires applications to be highly parallelized to overcome slightly higher per-operation latencies.

Common mistakes

Thinking you can just change the mode on an existing file system (you actually have to create a new one and migrate data, though the concept is to use Max I/O).

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