Opening The System - Lenovo ThinkSystem DM3000 series Hardware Installation And Maintenance Manual

Shutting down the controller
To shut down the degraded controller, you must determine the status of the controller and, if necessary, take
over that controller so that the healthy controller continues to serve data for the degraded controller's
storage.
Step 1. If the degraded controller is part of an HA pair, disable automatic giveback from the console of the
healthy controller using the following command: storage failover modify -node local -auto-
giveback false
Take the degraded controller to the LOADER prompt by typing halt.
Step 2.
If the degraded controller is displaying...
The LOADER prompt
Waiting for giveback...
System prompt or password prompt
Step 3. Turn off the power supplies, and then unplug the degraded controller's power cords from the
power source.

Opening the system

To access components inside the controller, you must first remove the controller module from the system
and then remove the cover on the controller module.
Step 1. If you are not already grounded, properly ground yourself.
Step 2. Loosen the hook and loop strap binding the cables to the cable management device, and then
unplug the system cables and SFPs (if needed) from the controller module, keeping track of where
the cables were connected. Leave the cables in the cable management device so that when you
reinstall the cable management device, the cables are organized.
Step 3. Remove and set aside the cable management devices from the left and right sides of the controller
module.
Step 4. Squeeze the latch on the cam handle until it releases, open the cam handle fully to release the
controller module from the midplane, and then, using two hands, pull the controller module out of
the chassis.
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ThinkSystem DM3000x and DM5000x Hardware Installation and Maintenance Guide
Then...
Go to the next step.
Press Ctrl-C, and then respond y when
prompted.
Take over or halt the degraded controller:
• For an HA pair, take over the degraded
controller from the healthy controller:
storage failover takeover -ofnode impaired_
node_name
When the degraded controller shows
Waiting for giveback..., press Ctrl-C, and
then respond y.