3.29.2011

Low Voltage CMOS Battery

The following procedure can be used in order to confirm a voltage problem alert being reported on a B-series server's CMOS battery.

The fault that will be sent is the following:
 code="F0424"
 descr="Possible loss of CMOS settings: CMOS battery voltage on server 1/1 is lower-critical"

In order to further troubleshoot this issue, the following commands can be used in order to collect
information about the CMOS battery's sensor:

 connect cimc <chassis>/<server>
 sensors

The sensor you should look for is: P3V_BAT_SCALED.
If the sensor reading is below 3.0V, a bad battery is typically the suspect.

The replacement part ID for the CMOS battery is: N20-MBLIBATT=
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6 comments:

  1. UnknownDecember 14, 2012 at 12:33 PM

    Where are these commands supposed to be run?

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    Replies
    1. AnonymousApril 10, 2013 at 9:22 AM

      They can be ran from putty or any other SSH console aplication

      Delete
  2. AnonymousApril 10, 2013 at 9:18 AM

    You can use the following commands:

    connect cimc x/x --> Chassis/blade

    That's gonna take you to the CIMC of the blade and then you can use the command:

    #sensors --> This is gonna show you the CMOS voltage on the first line.

    Ex:

    CIMC Debug Firmware Utility Shell [ cli ]
    [ help ]# sensors
    Sensor Name | Reading | Unit | Status| LNR | LC | LNC
    | UNC | UC | UNR
    ================================================================================
    ======================================
    P3V_BAT_SCALED | 2.996 | Volts | ok | 2.178 | 2.350 | na
    | na | 3.168 | na

    For B and C series, the command is different.

    For C series you need to run the following commands:

    #scope chassis
    #connect debug-shell

    C200M2# connect debug-shell
    CIMC Debug Firmware Utility Shell [ cli ]
    [ help ]# sensors
    Sensor Name | Reading | Unit | Status| LNR | LC | LNC
    | UNC | UC | UNR
    ================================================================================
    ======================================
    P3V_BAT_SCALED | 2.996 | Volts | ok | 2.178 | 2.350 | na
    | na | 3.168 | na

    Hope this answer your question!

    ReplyDelete
  3. UnknownOctober 21, 2013 at 9:25 PM

    I also don't know about the code of the batteries. Glad that you shared this to us. Thanks for sharing.




    UPS BATTERIES

    ReplyDelete
  4. AboelazmMay 4, 2019 at 8:38 AM

    thanks alot,for me to work i had to connect local management first.
    # connect local-mgmt
    #connect cimc chassis/blade
    #sensors

    ReplyDelete
  5. KolzAugust 26, 2019 at 12:26 PM

    Is it must to replace CMOS battery if P3V_BAT_SCALED reading is below 3.0V?

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