Chapter 6. Replacing An Nsm Module - Lenovo ThinkSystem DM240N Service Manual

Chapter 6. Replacing an NSM module

You can replace an impaired NVMe shelf module (NSM) nondisruptively in an DM240N drive shelf that is
powered on, and while I/O is in progress.
Before you begin
• All other components in the system, including the other NSM module, must be functioning properly.
• You must have verified that the shelf containing the failed FRU is cabled correctly, by downloading and
running ThinkSystem Intelligent Monitoring Config Advisor. If any cabling errors are generated, follow the
corrective actions provided.
Lenovo Downloads: ThinkSystem Intelligent Monitoring Config Advisor
About this task
• Replacing the NSM module involves moving the DIMMs, fans and power supply from the impaired NSM
module to the replacement NSM module.The real-time clock (RTC) battery comes preinstalled in the
replacement NSM module.
Note: After the NSM module replacement is completed, its RTC clock is automatically synchronized by
ONTAP. RTC clock synchronization might take up to one day to initiate.
• Allow at least 70 seconds between removal and installation of the NVMe shelf module (NSM).70 seconds
is the time it takes for ONTAP to recover: clean up the data structures and the driver to register the shelf ID
correctly.
• 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
• Shelf (NSM) firmware is automatically updated (nondisruptively) on a new NSM module that has a non-
current firmware version.NSM module firmware checks occur every 10 minutes. An NSM module firmware
update can take up to 30 minutes.
• 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 NSM module, save all packing materials for use when you return the
failed NSM module. 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
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