• The correct USB device driver is installed.
• The operating system supports USB devices.
2. Make sure that the USB configuration options are set correctly in system setup.
Restart the server and press F1 to display the Lenovo XClarity Provisioning Manager V3 system setup
interface. Then, click System Settings ➙ Devices and I/O Ports ➙ USB Configuration.
3. If you are using a USB hub, disconnect the USB device from the hub and connect it directly to the
server.
Memory problems
See this section to resolve issues related to memory.
• “Displayed system memory is less than installed physical memory” on page 237
• “Multiple memory modules in a channel identified as failing” on page 238
• “Extra namespace appears in an interleaved region” on page 238
• “Migrated PMEMs are not supported” on page 239
• “Invalid memory population detected” on page 239
• “PMEMs installed in wrong slots after system board replacement” on page 239
• “After PMEMs are reconfigured, error messages and LEDs persist to indicate PMEMs are installed in
wrong slots” on page 240
• “Cannot create goal successfully when installing PMEMs to the system for the first time” on page 240
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. 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.
Chapter 5. Problem determination 237
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