Lenovo 7D8T, Maintenance Manual

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5. Replace the highest-numbered memory module of those identified; then, restart the server. Repeat as
necessary.
6. Reverse the memory 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.
7. (Trained technician only) Install the failing memory module into a memory module connector for
processor 2 (if installed) to verify that the problem is not the processor or the memory module connector.
8. (Trained technician only) Replace the system board.
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.
• If PMEMs are installed:
a. Refer to “PMEM rules” in
Setup Guide
and see if the displayed memory fits the mode description.
b. All the saved data have been backed up, and created namespaces are deleted before any PMEM
is replaced or added.
c. 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 the key specified in the on-screen
instructions, the Lenovo XClarity Provisioning Manager 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.
Chapter 4
.
Problem determination
185