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Maintaining the Server Chassis
Caution
The chassis top covers are designed to allow access to replaceable components without exposing the user to
high voltages. However, to completely remove power when moving a chassis, you must disconnect all power
cords from the power supplies in the chassis.
Compute Node Power
Compute nodes include a physical power button so that you can shut down the individual node and any
installed operating system by using the power button on the node or the software interface.
Caution
To avoid data loss or damage to your operating system, you should always invoke a graceful shutdown.
The compute node can run in either of two power modes:
• Main power mode—Power is supplied to all server components and any operating system on your drives
• Standby power mode—Power is supplied only to the service processor and certain components. It is safe
Shutting Down a Node Using the Power Button
Step 1
Check the color of the Power button/LED on the face of the compute node:
• Amber—The node is already in standby mode and you can safely remove it from the chassis.
• Green—The node is in main power mode and must be shut down before you can safely remove it from the chassis.
Step 2
Invoke a graceful shutdown by pressing and releasing the Power button.
Caution
To avoid data loss or damage to your operating system, you should always invoke a graceful shutdown of the
operating system. Do not power off a node if any firmware or BIOS updates are in progress.
With a graceful shutdown, the operating system performs a graceful shutdown and the node goes to standby mode, which
is indicated by an amber Power button/LED.
As a best practice, attempt a graceful shutdown first. As an option, you can also invoke an Emergency shutdown, by
pressing and holding the Power button for 4 seconds to force the main power off and immediately enter standby mode.
Shutting Down a Node Using The Cisco IMC GUI
You must log in with user or admin privileges to perform this task.
Step 1
In the Navigation pane, click the Chassis tab.
Step 2
On the Chassis tab, click Summary.
Step 3
In the toolbar above the work pane, click the Host Power link.
can run.
for the operating system and data to remove the node from the chassis in this mode.
Shutting Down a Node Using the Power Button
Cisco UCS C4200 Server Chassis Installation and Service Guide
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