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FusionServer Pro Rack Server iBMC Alarm Handling 31

This document describes iBMC alarms in terms of the meaning, impact on the system, possible causes, and handling suggestions.

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ALM-0x2900FFFF Battery Low (RTC Battery/RAID controller card BBU/PCIeN Card BBU)

ALM-0x2900FFFF Battery Low (RTC Battery/RAID controller card BBU/PCIeN Card BBU)


Alarm message:

Battery low
This alarm is generated when the following faults occur:
  • The real-time clock (RTC) battery on the mainboard fails or the RTC battery voltage is low.
  • The BBU (iBBU or supercapacitor) of the RAID controller card is faulty or the BBU voltage is low.

Sensor triggering the alarm:

  • RTC Battery
  • RAID controller card BBU
  • PCIeN Card BBU


Alarm ID Alarm Severity Auto Clear





Name Meaning


Indicates a PCIe slot number.

Impact on the System

  • The real-time clock (RTC) battery failure causes incorrect system time, data loss on the complementary metal-oxide-semiconductor (CMOS), and system configuration errors.

  • If the BBU of the RAID controller card is faulty, the power-off protection for cache data is affected.

Possible Causes

  • The battery is not installed on the mainboard or is low in power.

  • The BBU of the RAID controller card is faulty.


  1. Replace the battery or the BBU of the RAID controller card and check whether the alarm is cleared.

    • Replace the iBBU or supercapacitor of the RAID controller card when the BBU is faulty.
    • Replace the mainboard when the RTC battery is faulty.

    For details, see the server user guide.

    • If yes, no further action is required.

    • If no, go to 2.

  2. Contact Huawei technical support.
Updated: 2019-11-19

Document ID: EDOC1000054724

Views: 412539

Downloads: 3250

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