Lenovo ThinkSystem SR950 Setup Manual page 279

• If neither LED is lit or flashing, check the hard disk drive backplane (go to step Hard disk drive
problems).
• If the green activity LED is flashing and the yellow status LED is lit, replace the drive. If the activity of
the LEDs remains the same, go to step Hard disk drive problems. If the activity of the LEDs changes,
return to step 1.
4. Make sure that the hard disk drive backplane is correctly seated. When it is correctly seated, the drive
assemblies correctly connect to the backplane without bowing or causing movement of the backplane.
5. Reseat the backplane power cable and repeat steps 1 through 3.
6. Reseat the backplane signal cable and repeat steps 1 through 3.
7. Suspect the backplane signal cable or the backplane:
• Replace the affected backplane signal cable.
• Replace the affected backplane.
8. Run the diagnostics tests for the hard disk drives. When you start a server and press F1, the Lenovo
XClarity Provisioning Manager interface is displayed by default. You can perform hard drive diagnostics
from this interface. From the Diagnostic page, click Run Diagnostic ➙ HDD test.
Based on those tests:
• If the adapter passes the test but the drives are not recognized, replace the backplane signal cable
and run the tests again.
• Replace the backplane.
• If the adapter fails the test, disconnect the backplane signal cable from the adapter and run the tests
again.
• If the adapter fails the test, replace the adapter.
Displayed system memory less than installed physical memory
Complete the following steps until the problem is resolved:
1. Make sure that:
• No error LEDs are lit on the operator information panel.
• No DIMM 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.
• If you changed the memory, you updated the memory configuration in the Lenovo XClarity
Provisioning Manager.
• 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 177 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 177).
.
Chapter 5 Resolving installation issues
275