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Oracle® Exadata Database Server X8-8 Service Manual

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Updated: June 2020

Identify and Remove a Faulty DIMM

  1. Use Oracle ILOM to identify the location of the failed DIMM and obtain CMOD designation information.

    See Troubleshooting Server Hardware Faults.

  2. Prepare the server for warm service.

    See Preparing the Server for Component Replacement.

    Note -  This procedure can also be completed as a cold service procedure.
  3. Remove the CMOD that contains the failed DIMM.

    See Remove a CMOD.

  4. Remove the CMOD top cover.

    See Remove the CMOD Cover.

    To remove the CMOD top cover, push the release button, slide the CMOD cover toward the back of the CMOD, and lift it away.

  5. Identify and note the location of the faulty DDR4 DIMM by pressing the Fault Remind button on the motherboard.

    Faulty DIMMs are identified with a corresponding amber LED on the motherboard.

    • If the DIMM Fault LED is off, then the DIMM is operating properly.

    • If the DIMM Fault LED is on (amber), then the DIMM is faulty and should be replaced [4].

    To locate the failed DIMM, press and hold the Fault Remind button [1].

    This procedure uses the DIMM fault remind test circuit in the CMOD to identify the failed DIMM. The circuit is a charged, time-limited circuit. Once power is removed from the server you have 10 minutes to use the circuit for troubleshooting.

    image:Image with call outs showing the location of the components
                                    in the DIMM Fault Remind test circuit.
    Call Out
    Fault Remind button. To locate a failed DIMM, press and hold.
    Fault Remind Power LED Charge Status indicator
    DIMM slots
    DIMM slot fault LED indicators (one for each slot)
    Processor fault LED indicator
  6. Verify that the green Fault Remind Power LED indicator [1] is lit.

    The Charge Status indicator [2] lights if the Fault Remind circuit is operational.

    The Fault Remind circuit remains charged for about 10 minutes after power is removed from the CMOD, either by disconnecting power from the server, or by removing the CMOD from the chassis. When you press the Fault Remind button, the Charge Status indicator lights if there is enough power to use the fault remind circuit. Otherwise it remains unlit.

  7. With the Fault Remind button pressed, look for a lit DIMM fault LED indicator [4].

    Each DIMM slot has a fault indicator. Twelve DIMM fault LED indicators are located next to the DIMM slots.

  8. Rotate both DIMM socket ejectors outward as far as they will go.

    The DIMM is partially ejected from the socket. This action extracts the DIMM from its connector.

    image:Figure showing DIMM slot ejector levers.
  9. Remove the faulty DIMM from the CMOD.

    Carefully lift the DIMM straight up to remove it from the socket.

    image:Image showing a DIMM being removed from its slot.
  10. Replace each faulty DIMM with either another DIMM of the same rank size (quad-rank or dual-rank) or leave the socket empty.

    For DIMM replacement instructions, see Install a DIMM.

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