Data Domain: False Alert for DS60 Power Supply Fan - ENVIRONMENT-00004

Summary: Data Domain Support and Engineering are aware of an issue where a false alert is generated for 'Power Module B Fan 2' on DS60 enclosures. This alert typically occurs in partially populated DS60 units and does not indicate hardware failure. ...

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Symptoms

Applies to: 

  • DS60
  • All DD OS versions

Symptoms:

  • Alert: 
    • EVT-ENVIRONMENT-00004 – Power module B fan 2 has failed.
  • Affected platform: DS60 enclosure, all DD OS versions.
  • Commonly seen in quarter or half-populated DS60 units.
  • CLI output from #enclosure show fans shows 
    • # enclosure show fans
Enclosure 2
        Fans
                Description            Level   Status
                --------------------   -----   ------
                Cooling module fan 1   low     OK
                Cooling module fan 2   low     OK
                Cooling module fan 3   low     OK
                Power module A fan 1   low     OK
                Power module A fan 2   low     OK
                Power module B fan 1   low     OK
                Power module B fan 2   low     FAILED     <<<------ 
                --------------------   -----   ------

    Cause

    Engineering suspects that pressure variance between populated and unpopulated sections of the DS60 enclosure may interfere with the adaptive cooling features of the PSU.

    Although replacing the PSU clears the alert, returned units consistently test as healthy, and the issue may recur. The root cause is under investigation, and a fix is expected in a future DD OS release.


     

    Resolution

    To clear the false alert:

    1. Reseat the affected PSU:

      • Disconnect AC power from the PSU.
      • Remove the PSU from its slot.
      • Wait 20 seconds.
      • Reinsert the PSU and reconnect AC power.

    2. Verify system status using:

      • #enclosure show powersupply
      • #enclosure show fans
      • #alerts show current

    3. If the alert persists:

      • Swap the PSU with a known-good unit from another DS60 enclosure (if available).
      • If unresolved, contact your Service Provider and raise a Support Request.
    Note: This issue does not pose an immediate operational risk, but should be addressed to prevent alert fatigue and unnecessary hardware replacements. 

    Additional Information

    Engineering is confident that a reseat resolves this false alert.
    If a genuine fan failure is diagnosed, proceed to replace the PSU.

    Affected Products

    Data Domain

    Products

    Data Domain, Data Domain Deduplication Storage Systems, DS60
    Article Properties
    Article Number: 000055420
    Article Type: Solution
    Last Modified: 13 Oct 2025
    Version:  4
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