Light path diagnostics LEDs - IBM MAX5

Use this information to diagnose and solve possible errors that are indicated by the light path diagnostics LEDs.

The following table describes the LEDs on the IBM MAX5 expansion blade system board and suggested actions to correct detected problems. For information about the location of the LEDs on the expansion blade system board, see System-board LEDs - IBM MAX5 expansion blade. See Viewing the light path diagnostics LEDs for information about lighting the LEDs.

  • Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved.
  • See Parts listing - BladeCenter HX5 to determine which components are CRUs and which components are FRUs.
  • If an action step is preceded by "(Trained service technician only)," that step must be performed only by a trained service technician.
Lit light path diagnostics LED Description Action
DIMM x error A memory error occurred.
  1. View the logs to determine if there are memory predictive failure alerts or uncorrectable memory errors for any of the installed DIMMs. If so, replace the specified DIMM. See Removing a DIMM - IBM MAX5 expansion blade and Installing a DIMM - IBM MAX5.
  2. Make sure that the DIMM that is indicated by the lit LED is supported. See Parts listing - BladeCenter HX5.
  3. Reseat the DIMM that is indicated by the lit LED. See Removing a DIMM - IBM MAX5 expansion blade and Installing a DIMM - IBM MAX5.
  4. Typically the LEDs for both DIMMs in a DIMM pair will be lit (even if there is a problem with only one of the DIMMs). Therefore, you must isolate and replace the failing DIMM:
    1. Swap one of the DIMMs in the failing pair with a DIMM from another DIMM pair (see Installing a DIMM - IBM MAX5 to determine which DIMMs are paired).
    2. Enable the DIMM connectors (slots) for the swapped DIMMs using the Setup utility (see Using the Setup utility) or using the Advanced Setting Utility (see Using the Advanced Settings Utility (ASU)).

      To enable the DIMM connectors using the Setup utility, select System Settings and then select Memory.

    3. Run the DSA memory test (see IBM Dynamic System Analysis).
    4. Replace the appropriate DIMM:
      • If the same problem persists for the original pair of DIMMs, replace the DIMM from that pair that you did not swap.
      • If the problem follows the DIMM (the DIMM pair from which you removed the DIMM in step 4.a), replace the swapped DIMM in that DIMM pair

      After you replace a DIMM as a result of this alert, you must enable the DIMM connector (slot) for that DIMM using the Setup utility (see Using the Setup utility) or using the Advanced Setting Utility (see Using the Advanced Settings Utility (ASU)).

      To enable the DIMM connector using the Setup utility, select System Settings and then select Memory.

      For example: assume that you are receiving this alert for DIMM pair 1 and 8
      1. Swap DIMM 13 (the DIMM pair is DIMM 13 and DIMM 17) and DIMM 1.
      2. Run the DSA memory test.
        • If the problem persists and DIMM 1 and 8 continue to be specified, replace DIMM 8.
        • If the problem persists and DIMM 13 and 17 are specified, replace DIMM 13.
      3. Enable the DIMM connector for the DIMM that was replaced.
After installing a DIMM as a result of a DIMM failure, you might need to re-enable the DIMM connector (slot) for the DIMM that you replaced. To determine whether you need to re-enable the DIMM:
  1. Verify that the amount of memory installed in the IBM MAX5 is the expected amount of memory. You can verify the amount of memory that is installed through the operating system, by watching the monitor as the blade server starts up, or through the advanced management module web interface.

    For more information about the advanced management module web interface, see the ../com.ibm.bladecenter.advmgtmod.doc/adv_man_mod_printable_doc.html.

  2. Run the Setup Utility to re-enable the DIMMs (see Using the Setup utility for more information).
Parent topic: Light path diagnostics