Lenovo ThinkAgile VX7820 User Manual page 264

• Memory mirrored channel does not account for the discrepancy.
• The memory modules are seated correctly.
• You have installed the correct type of memory.
• If you changed the memory, you updated the memory configuration in the Lenovo XClarity
Provisioning Manager Lite.
• 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 are no memory errors when the server is at the minimum memory configuration.
• When DCPMMs are installed:
a. If the memory is set in App Direct or Mixed memory mode, all the saved data have been backed
up, and created namespaces are deleted before any DCPMM is replaced.
b. Refer to "DC Persistent Memory Module (DCPMM) setup" on page 178 and see if the displayed
memory fits the mode description.
c. If DCPMMs are recently set in Memory mode, turn it back to App Direct mode and examine if
there is namespace that has not been deleted (see "DC Persistent Memory Module (DCPMM)
setup" on page 178).
d. Go to the Setup Utility, select System Configuration and Boot Management ➙ Intel Optane
DCPMMs ➙ Security, and make sure all the DCPMM units are unlocked.
2. Reseat the DIMMs, and then restart the server.
3. Run memory diagnostics. When you start a server and press F1, the Lenovo XClarity Provisioning
Manager Lite interface is displayed by default. You can perform memory diagnostics from this interface.
From the Diagnostic page, click Run Diagnostic ➙ Memory test.
4. Check the POST error log:
• If a DIMM was disabled by a systems-management interrupt (SMI), replace the DIMM.
• If a DIMM was disabled by the user or by POST, reseat the DIMM; then, run the Lenovo XClarity
Provisioning Manager Lite and enable the DIMM.
5. Run memory diagnostics. When you start a solution and press F1, the Lenovo XClarity Provisioning
Manager Lite interface is displayed by default. You can perform memory diagnostics with this interface.
From the Diagnostic page, go to Run Diagnostic ➙ Memory test or DCPMM test.
Notes: When DCPMMs are installed, run diagnostics based on the mode that is set presently:
• App Direct mode:
– Run Memory Test for DRAM memory modules.
– Run DCPMM Test for DCPMMs.
• Memory and Mixed memory mode:
Run both Memory Test and DCPMM Test for DCPMMs.
6. Move the suspect DIMMs in one channel to another channel of the same processor that is a supported
configuration, and then restart the server. If the problem is related to a memory module, replace the
failing memory module.
Note: When DCPMMs are installed, only adopt this method in Memory mode.
7. Replace the DIMM.
8. Restart the server.
User Guide for ThinkAgile VX7820 Appliance, ThinkAgile VX 4-Socket 4U Certified Node
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