# Cache utilization metrics
<a name="utilization-metrics"></a>

The following metrics report cache-level storage information. These metrics take one dimension (`FileCacheId`) and are published into the `AWS/FSx` namespace in CloudWatch.


| Metric | Description | 
| --- | --- | 
| `FreeDataStorageCapacity` |  The amount of available data storage capacity. The `Sum` statistic is the total number of bytes available in the cache The `Minimum` statistic is the total number bytes available in the fullest disk. The `Maximum` statistic is the total number of bytes available in the disk with the most remaining available storage. The `Average` statistic is the average number of bytes available per disk. The `SampleCount` statistic is the number of disks. Units: [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/fsx/latest/FileCacheGuide/utilization-metrics.html) Valid statistics: `Sum`, `Minimum`, `Maximum`, `Average`, `SampleCount`.  | 
| `FreeMetadataStorageCapacity` | The amount of available metadata storage capacity. The `Sum` statistic is the total number of bytes of metadata storage available in the cache. The `Minimum` statistic is the total number of bytes available in the fullest metadata target (MDT) disk. The `Maximum` statistic is the total number of bytes available in the MDT disk with the most remaining storage. The `Average` statistic is the average number of bytes available per MDT disk. The `SampleCount` statistic is the number of MDT disks. Units: [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/fsx/latest/FileCacheGuide/utilization-metrics.html) Valid statistics: `Sum`, `Minimum`, `Maximum`, `Average`, `SampleCount`.  |