1 Power-supply-unit LED (bi-color, green and yellow)
Status
Description
Blinking (yellow,
about one flash
per second)
The power supply unit is showing warnings, indicating over-temperature warning (OTW), over-
current warning (OCW), or a slow fan speed.
Off The server is powered off, or the power supply unit is not working properly. If the server is
powered on but the LED is off, replace the power supply unit.
Rear M.2 LEDs
This topic provides troubleshooting information for the rear M.2 drive assembly.
•
“LEDs on the rear M.2 interposer” on page 311
• “LEDs on the rear M.2 backplane” on page 312
LEDs on the rear M.2 interposer
Figure 332. Rear M.2 interposer LEDs
The normal status of the LEDs on the interposer is that activity LED blinks and status LED remains off.
LED
Status and description
1 Activity LED
(green)
On: The M.2 drive is idle.
“Off: The M.2 drive appears de-asserted.” on page 311
Blinking (about four flashes per second): The I/O activity of the M.2 drive is in progress.
2 Status LED
(yellow)
On: A drive fault occurs.
Off: The M.2 drive is working normally.
Fast blinking (about four flashes per second): The M.2 drive is being located.
Slow blinking (about one flash per second): The M.2 drive is being rebuilt.
Rear M.2 drive de-asserted problem
1. Hot-swap the two side-by-side M.2 drive assemblies with each other to see if the problem persists.
2. If the problem persists:
• Scenario 1: activity LED remains off, replace the interposer. If replacing interposers does not work, it
can be a power or PSoC fault, collect FFDC file and contact Lenovo Support.
• Scenario 2: both LEDs are on, access the drive information on XCC:
– If the information is accessible but the drive remains de-asserted, replace the drive or check RAID
chip log in FFDC file to see if any helpful information is available.
– If the information is not accessible, check RAID chip log in FFDC file, replace the interposer or
drive.
Chapter 7. Problem determination 311
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