# Performance warnings and recommendations
<a name="performance-insights"></a>

FSx for Lustre displays a warning for CloudWatch metrics when one of these metrics approaches or crosses a predetermined threshold for multiple consecutive data points. These warnings provide you with actionable recommendations that you can use to optimize your file system's performance.

Warnings are accessible in several areas of the **Monitoring & performance** dashboard on the Amazon FSx for Lustre console. All active or recent Amazon FSx performance warnings and CloudWatch alarms configured for the file system that are in an alarm state appear in the **Monitoring & performance** panel in the **Summary** section. The warning also appears in the section of the dashboard where the metric graph is displayed. These warnings automatically disappear from the dashboard 24 hours after the underlying metrics fall below the warning threshold.

You can create CloudWatch alarms for any of the Amazon FSx metrics. For more information, see [Creating CloudWatch alarms to monitor metrics](creating_alarms.md).

## Use performance warnings to improve file system performance
<a name="resolve-warnings"></a>

Amazon FSx provides actionable recommendations that you can use to optimize your file system's performance. You can take the recommended action if you expect the issue to continue, or if it's causing an impact to your file system's performance. Depending on which metric has triggered a warning, you can resolve it by increasing the file system's throughput capacity, storage capacity, or metadata IOPS, as described in the following table.

[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/fsx/latest/LustreGuide/performance-insights.html)

For more information about file system performance, see [Amazon FSx for Lustre performance](performance.md).