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"Extra namespace appears in an interleaved region" on page 163
Displayed system memory is less than installed physical memory
Complete the following steps until the problem is solved:
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
Optane DC Persistent Memory (DCPMM) setup" 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 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 "Intel Optane DC Persistent Memory (DCPMM) setup" in Setup Guide 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 "Intel Optane DC Persistent Memory (DCPMM)
setup" in Setup Guide).
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 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 according to the on-screen
instructions, the LXPM interface is displayed by default. (For more information, see the "Startup" section
in the LXPM documentation compatible with your server at
lxpm_frontend/lxpm_product_page.html
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:
ThinkSystem SR850 Maintenance Manual
162
https://sysmgt.lenovofiles.com/help/topic/
.) You can perform memory diagnostics with this interface. From
"Specifications" on page 1
or "Intel
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