Chapter 2. Hot-Swapping A Power Supply - Lenovo ThinkSystem DM240N Service Manual

Chapter 2. Hot-swapping a power supply

You can replace a failed power supply nondisruptively in an DM240N drive shelf that is powered on, and
while I/O is in progress.
About this task
• If you are replacing more than one power supply, you must do so one at a time so that the shelf maintains
power.
• Best practice: The best practice is to replace the power supply within two minutes of removal from the
NSM module.If you exceed the two minutes, the shelf continues to function, but ONTAP sends messages
to the console about the degraded power supply until the power supply is replaced.
• Best practice: The best practice is to have current versions of NVMe shelf module (NSM) firmware and
drive firmware on your system before replacing FRU components.
Note: Do not revert firmware to a version that does not support your shelf and its components.
Lenovo Downloads: Disk Shelf Firmware
Lenovo Downloads: Disk Drive and Firmware
• If needed, you can turn on the shelf's location (blue) LEDs to aid in physically locating the affected shelf:
storage shelf location-led modify -shelf-name shelf_name -led-status on If you do not know the shelf_
name of the affected shelf, run the storage shelf show command.
A shelf has three location LEDs: one on the operator display panel and one on each NSM module.
Location LEDs remain illuminated for 30 minutes. You can turn them off by entering the same command,
but using the off option.
• When you unpack the replacement power supply, save all packing materials for use when you return the
failed power supply. You return the failed part to Lenovo as described in the RMA instructions shipped
with the kit. If you need the RMA number or additional help with the replacement procedure, contact
technical support at
Lenovo Support
+800-800-80-800 (Asia/Pacific).
A video for this task is available at:
• Youtube: https://www.youtube.com/playlist?list=PLYV5R7hVcs-BhZmHgn868u8QatfgH8JW4
• Youku: https://list.youku.com/albumlist/show/id_52419127
Step 1. Properly ground yourself.
Step 2. Physically identify the failed power supply.
The system logs a warning message to the system console indicating which power supply failed.
Additionally, the attention (amber) LED on the shelf operator display panel illuminates and the
bicolored LED on the failed power supply illuminates red.
Step 3. Disconnect the power cord from the power supply by opening the power cord retainer, and then
unplug the power cord from the power supply. Power supplies do not have a power switch.
Step 4. Remove the failed power supply:
a. Rotate the cam handle to its open (horizontal) position, and then grasp it.
b. With your thumb, press the blue tab to release the locking mechanism.
c. Pull the power supply out of the NSM module while using your other hand to support its
weight.
Step 5. Insert the replacement power supply:
© Copyright Lenovo 2020
, 888-463-8277 (North America), 00-800-44-638277 (Europe), or
5