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Memory problems

Use this information to resolve issues related to memory.

Displayed system memory is less than installed physical memory​

Complete the following steps until the problem is solved.
  1. Make sure that:
    1. You have installed the correct type of memory (see Install a memory module).

    2. Memory mirroring or memory sparing mode does not account for the discrepancy.

      To determine the status of a DIMM, restart the server and press the key specified in the on-screen instructions to display theLXPM interface. Then, click System settings > Memory. (For more information, see the Startup section in the LXPM documentation compatible with your server at Lenovo XClarity Provisioning Manager portal page.)

  2. If new memory has recently been installed, make sure that no configuration events are reported in the event log. If there are any events, resolve them.
    Note
    DIMMs are verified as authentic Lenovo or IBM modules by the UEFI software. If any non-authentic DIMMs are detected, an informational message appears in the system event log and memory performance might be limited. Non-authentic DIMMs are not covered by your Lenovo warranty.
  3. If the compute node was recently installed, moved, or serviced, make sure that the DIMMs are correctly seated in the connectors (see Install a memory module).

  4. Make sure that all DIMMs are enabled. The compute node might have automatically disabled a DIMM when it detected a problem, or a DIMM might have been manually disabled.

    To determine the status of a DIMM, restart the server and press the key specified in the on-screen instructions to display the LXPM interface. Then, click System settings > Memory.

  5. Run memory diagnostics. When you start a server and press the key specified in the on-screen instructions, the LXPM interface is displayed by default. You can perform memory diagnostics from this interface. From the Diagnostic page, click Run Diagnostic > Memory test.

  6. Remove DIMMs until the compute node is showing the correct amount of memory. Install one DIMM at a time until you can determine which DIMM is not working properly. Remove that DIMM and replace it with a good DIMM (see [LINK]DIMM replacement[LINK]).
    Note
    After you install or remove a DIMM, you must change and save the new configuration information by using the Setup utility. When you turn on the compute node, a message indicates that the memory configuration has changed. Press the key specified in the on-screen instructions to display the LXPM interface. Then, save the configuration.
  7. If the problem remains, contact Lenovo Support.