Lenovo ThinkSystem SR635 V3 User Manual page 328

• "Yellow hard disk drive status LED does not represent actual state of associated drive" on page 319
• "U.3 NVMe drive can be detected in NVMe connection, but cannot be detected in Tri-mode" on page 319
Server cannot recognize a hard drive
Complete the following steps until the problem is solved.
1. Observe the associated yellow hard disk drive status LED. If the LED is lit, it indicates a drive fault.
2. If the status LED is lit, remove the drive from the bay, wait 45 seconds, and reinsert the drive, making
sure that the drive assembly connects to the hard disk drive backplane.
3. Observe the associated green hard disk drive activity LED and the yellow status LED and perform
corresponding operations in different situations:
• If the green activity LED is flashing and the yellow status LED is not lit, the drive is recognized by the
controller and is working correctly. Run the diagnostics tests for the hard disk drives. When you start
a server 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
You can perform hard drive diagnostics from this interface. From the Diagnostic page, click Run
Diagnostic ➙ Disk Drive Test.
• If the green activity LED is flashing and the yellow status LED is flashing slowly, the drive is
recognized by the controller and is rebuilding.
• If neither LED is lit or flashing, check whether the hard disk drive backplane is correctly seated. For
details, go to step 4.
• If the green activity LED is flashing and the yellow status LED is lit, replace the drive.
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 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
sysmgt.lenovofiles.com/help/topic/lxpm_frontend/lxpm_product_page.html
diagnostics from this interface. From the Diagnostic page, click Run Diagnostic ➙ Disk Drive Test.
Based on those tests:
• If the backplane 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.
Multiple hard drives fail
Complete the following steps until the problem is solved:
• View the Lenovo XClarity Controller event log for events related to power supplies or vibration issues and
resolve those events.
ThinkSystem SR635 V3 User Guide
318
https://sysmgt.lenovofiles.com/help/topic/lxpm_frontend/lxpm_product_page.html
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.) You can perform hard drive
.)