The amount of system memory that is displayed is less than the amount of physical memory installed in the system

  1. Make sure that:
    1. You have installed the correct type of memory (see Installing a DIMM).
    2. Memory mirroring or memory sparring mode does not account for the discrepancy. You can check the memory configuration in the Setup utility (see Using the Setup utility).
  3. 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.
  4. If the compute node was recently installed, moved, or serviced, make sure that the DIMMs are correctly seated in the connectors (see Installing a DIMM).
  5. 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 (see Using the Setup utility).
  6. Run memory diagnostics (see IBM Dynamic System Analysis).
  7. 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 Removing a DIMM, and Installing a DIMM).
  8. If the problem remains, contact IBM Support.
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Parent topic: Memory problems