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E9000 Server V100R001 HMM Alarm Handling 19

This document describes E9000 server alarms in terms of the meaning, impact on the system, possible causes, and solutions.
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Swi: Overvoltage (Major, MOS Volt Drop)

Swi: Overvoltage (Major, MOS Volt Drop)


Alarm message:

Voltage above upper major threshold


The MOS FET voltage drop (arg1 V) of the soft-start circuit on the mainboard exceeds the threshold (arg2V).

The voltage difference of the MOSFET on the mainboard exceeds the major threshold.

This alarm is generated by the following sensor:

MOS Volt Drop


Alarm ID

Alarm Severity

Auto Clear




Impact on the System

The mainboard is malfunctioning.

Possible Causes

The switch module is faulty.


  1. Back up service data of the switch module and switch over services to the standby network.
  2. Reseat the switch module. Then check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 3.

  3. Replace the switch module. Then, check whether the alarm is cleared.

    For details about how to replace the switch module, see the E9000 Server User Guide..

    • If yes, no further action is required.
    • If no, go to 4.

  4. On the HMM WebUI, choose System Management > Information Collection, and collect logs.
  5. Contact Huawei technical support.
Updated: 2018-08-16

Document ID: EDOC1000015902

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