Data Domain: How To Modify the Space Usage Alert Threshold

Summary: This article provides steps to set a warning for space utilization on Data Domain systems.

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Instructions

By default Data Domain posts an alert when space utilization reaches 90%. However, this can be changed while utilization is between 50% and 90% depending on individual requirements.
 
Set the warning level for space usage with the following commands. The warning threshold can be between 50-90%. For example, to set the warning at 75% space usage:
sysadmin@datadomain# filesys option set warning-space-usage 75
sysadmin@datadomain# filesys option show warning-space-usage
warning-space-usage percentage is: 75
 
Set the critical space threshold with the following commands. The critical threshold can be between 75%-98%. For example, to set critical space usage at 85%:
sysadmin@datadomain# filesys option set critical-space-usage 85
sysadmin@datadomain# filesys option show critical-space-usage
critical-space-usage percentage is: 85
 
The critical-space-usage percentage should be set higher than the warning-space-usage percentage.
 
If assistance is needed with this article, contact your contracted support provider and open a service request.

Additional Information

Note: The Data Domain may still post a critical space alert at 90% even if the threshold is set higher. This is by design - see this article for more information.

Affected Products

Data Domain

Products

Data Domain, DD OS 6.2, DD OS, DD OS 6.0, DD OS 6.1
Article Properties
Article Number: 000013622
Article Type: How To
Last Modified: 20 Mar 2026
Version:  6
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