Disk Space % Used¶

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Description
Possible Observations
Common Triggers
Possible Solutions

Description¶

Disk Space % Used alerts indicate the percentage of used disk space on a partition reaches a specified threshold.

The Disk space % used on Data Partition alert occurs when the percentage of disk space used on any partition that contains the MongoDB collection data meets or exceeds a certain threshold. By default, the threshold is 90 percent of the cluster’s configured storage size.

The Disk space % used on Index Partition alert occurs when the percentage of disk space used on any partition that contains the MongoDB index data meets or exceeds a certain threshold. You specify the threshold when you configure this alert.

The Disk space % used on Journal Partition alert occurs when the percentage of disk space used on the partition that contains the MongoDB journal meets or exceeds a certain threshold. You specify the threshold when you configure this alert. This alert only occurs when journaling is enabled.

Possible Observations¶

You can observe a high percentage of used disk space in the following ways:

In the cluster metrics, the Disk Usage graph displays the used disk space in yellow. This indicates that the used disk space is approximately 70 percent of the Atlas cluster’s configured storage size.
Atlas nodes are unhealthy, because the used disk space reached the cluster’s configured storage size.
The cluster refuses writes and connections from the client.

Common Triggers¶

The following common events can trigger Disk Space % Used alerts:

The disk is full and Auto-Expand Storage is not enabled.
Auto-Expand Storage is enabled, but the disk filled too quickly for Atlas to expand the cluster’s storage space. This can happen during data migration.
Auto-Expand Storage is enabled, but Atlas cannot expand the cluster’s storage space because it has reached the maximum storage capacity for this cluster. For more information on cluster tier limits, see the Amazon Web Services, Google Cloud Platform, and Microsoft Azure instance configuration options.

Possible Solutions¶

Consider the following actions to help resolve Disk Space % Used alerts through the Atlas UI or API.

Atlas UI
Atlas API

Enable Auto-Expand Storage.

Note

If the disk fills too quickly, Atlas might not be able to expand the the cluster’s storage space in time, even if Auto-Expand Storage is enabled.
Manually increase the Storage of this cluster in the Cluster Tier section of the configuration page.
If you have reached the maximum storage capacity for this cluster, upgrade to a larger cluster tier in the Cluster Tier section of the configuration page.

Enable Auto-Expand Storage using the autoScaling.diskGBEnabled parameter.

Note

If the disk fills too quickly, Atlas might not be able to expand the the cluster’s storage space in time, even if Auto-Expand Storage is enabled.
Increase the storage of this cluster using the diskSizeGB parameter.
If you have reached the maximum storage capacity for this cluster, specify a larger cluster tier using the providerSettings.instanceSizeName parameter.

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