Lenovo ThinkSystem SR630 Maintenance Manual page 244

Displayed system memory is less than installed physical memory
Complete the following procedure to solve the problem.
Note: Each time you install or remove a memory module, you must disconnect the server from the power
source; then, wait 10 seconds before restarting the server.
1. Make sure that:
• No error LEDs are lit on the operator information panel.
• No memory module error LEDs are lit on the system board.
• Memory mirrored channel does not account for the discrepancy.
• The memory modules are seated correctly.
• You have installed the correct type of memory module (see "PMEM rules" in Setup Guide for
requirements).
• After changing or replacing a memory module, memory configuration is updated accordingly in the
Setup Utility.
• All banks of memory are enabled. The server might have automatically disabled a memory bank when
it detected a problem, or a memory bank might have been manually disabled.
• There is no memory mismatch when the server is at the minimum memory configuration.
• When PMEMs are installed:
a. Refer to "PMEM rules" in Setup Guide and see if the displayed memory fits the mode description.
b. If the memory is set in App Direct Mode, all the saved data have been backed up, and created
namespaces are deleted before any PMEM is replaced or added.
c. If PMEMs are recently set in Memory Mode, turn it back to App Direct Mode and examine if there
is namespace that has not been deleted.
d. Go to the Setup Utility, select System Configuration and Boot Management ➙ Intel Optane
PMEMs ➙ Security, and make sure security of all the PMEM units is disabled.
2. Reseat the memory modules, and then restart the server.
3. Check the POST error log:
• If a memory module was disabled by a systems-management interrupt (SMI), replace the memory
module.
• If a memory module was disabled by the user or by POST, reseat the memory module; then, run the
Setup utility and enable the memory module.
4. Run memory diagnostics. When you start a solution and press F1, the LXPM interface is displayed by
default. You can perform memory diagnostics with this interface. From the Diagnostic page, go to Run
Diagnostic ➙ Memory test or PMEM test.
Notes: When PMEMs are installed, run diagnostics based on the mode that is set presently:
• App Direct Mode:
– Run Memory Test for DRAM memory modules.
– Run PMEM Test for PMEMs.
• Memory Mode:
Run both Memory Test and PMEM Test for PMEMs.
5. Reverse the modules between the channels (of the same processor), and then restart the server. If the
problem is related to a memory module, replace the failing memory module.
Note: When PMEMs are installed, only adopt this method in Memory Mode.
ThinkSystem SR630 V2 Maintenance Manual
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