Data Domain: Troubleshooting Power Supply (PSU) Alerts

Summary: This article outlines how to identify and resolve Power Supply Unit (PSU) alerts on Data Domain systems. It explains PSU status indicators, verification methods using CLI and UI, and recommended troubleshooting steps. ...

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Instructions

Symptoms

  • PSU alert reported in Data Domain System Manager (UI) or CLI
  • System health status shows "Degraded"
  • Autosupport logs indicate PSU issues
  • PSU status appears as "Unpowered," "Absent," "Failed," "Faulty," or "Unavailable"

Cause

PSU alerts may be triggered by one or more of the following conditions:

Status Description
OK The power supply has AC power and is functioning properly.
Degraded One of the power supplies has no output.
Possible reasons:

    * Loose AC power cable
    * Power supply failure

Autosupport reports a status of Degraded if a PSU is unpowered or absent. The system is in a degraded state because the power supply redundancy is lost.
Unpowered The power supply lost AC power.
Possible reasons:

    * PSU is plugged into a bad power circuit.
    * There is a loose or unplugged power cable.
    * In some circumstances, PSU has failed.
Absent * The PSU is not physically present or available in the slot.
* The possible reason is that the PSU is not recognized in the slot.
*The power supply can be either good or faulty and report an Absent status.
Failed The power supply is not OK.
Faulty The power supply is not OK.
Unavailable This could be an issue with the reporting status of PSU. Reboot DD, if the issue still persists contact support.

Resolution

Step 1: Verify PSU Status.

Using CLI

  1. Connect to the Data Domain system using SSH, Telnet, or serial console.
  2. Run the following commands: 
    • # alerts show current  
# enclosure show all

Using Web UI

  1. Open a browser and enter the system’s hostname or IP address.
  2. Log in to Data Domain System Manager.
  3. Navigate to:
    • Health > Alerts > Current Alerts
    • Hardware > Chassis for detailed PSU status
Data Domain System Manager interface 

 

  • For further confirmation within the UI click Hardware > Chassis

    Data Domain System Manager inteface 
    Data Domain System Manager interface 

    Step 2: Troubleshoot PSU Alert

    • Ensure that all power cables are securely connected at both ends.
    • Verify that the power source (UPS, PDU, etc.) is stable and has sufficient capacity.
    • Check if recent maintenance activities may have triggered the alert.
    • If the alert persists, contact support.

Additional Information

Data Domain: "AC LOST"reported on DD6400 DD6900 DD9400 DD9900

Affected Products

Data Domain

Products

Data Domain, Data Domain Deduplication Storage Systems
Article Properties
Article Number: 000010794
Article Type: How To
Last Modified: 28 Oct 2025
Version:  13
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