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Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter3 Maintainin g the Server
Preparing for Server Component Installation
Preparing for Server Component Installation
This section describes how to prepare for component installation, and it includes the following topics:
•Required Equipment, page3-8
•Shutting Down and Powering Off the Server, page3-8
•Removing and Replacing the Server Top Cover, page3-9
•Replaceable Component Locations, page3-10
•Color-Coded Touch Points, page3-11

Required Equipment

The following equipment is used to perform the procedures in this chapter:
•Number 1 Phillips-head screwdriver
•Number 2 Phillips-head screwdriver
•Number 10 Torx screwdriver
•Electrostatic discharge (ESD) strap or other grounding equipment such as a grounded mat

Shutting Down and Powering Off the Server

The server can run in two power modes:
•Main power mode—Power is supplied to all server components and any operating system on your
hard drives can run.
•Standby power mode—Power is supplied only to the service processor and the cooling fans and it
is safe to power off the server from this mode.
You can invoke a graceful shutdown or a hard shutdown by using either the CIMC management interface
or the Power button on the front panel.
To use the Power button, follow these steps:
Step1 Check the color of the Power Status LED (see the “Front-Panel LEDs” section on page3-2).
•Green—The server is in main power mode and must be shut down before it can be safely powered
off. Go to Step 2.
•Amber—The server is already in standby mode and can be safely powered off. Go to Step3.
Step2 Invoke either a graceful shutdown or a hard shutdown:
Caution To avoid data loss or damage to your operating system, you should always invoke a graceful shutdown
of the operating system.
•Graceful shutdown—Press and release the Power button. The operating system performs a graceful
shutdown and the server goes to standby mode, which is indicated by an amber Power Status LED.
•Emergency shutdown—Press and hold the Power button for 4 seconds to force the main power off
and immediately enter standby mode.
Step3 Disconnect the power cords from the power supplies in your server to completely power off the server.