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Stopping the System
This section discusses the various ways to stop the system.
Attention: Using the power-on button on the operator panel or commands at the HMC to power off the
system can cause unpredictable results in the data files. The next initial program load (IPL) will also take
longer to complete if all applications are not stopped beforehand.
Stopping the System without a Hardware Management Console (HMC)
Attached
Attention: When shutting down your system, shut down all applications first and then shut down the
operating system. The system power turns off and the system goes into standby mode when the operating
system is shut down. If you are shutting down your system due to an error or to make a repair, write down
the information displayed on the operator panel before turning off the system power. Before removing
power from the system, ensure that the shutdown process is complete. Failure to do so can result in the
loss of data. Some option-installation procedures do not require the system to be stopped for installation.
The option-installation procedures in this chapter will direct you here if stopping the system is required.
1. Log in to the system as root user.
2. Stop all applications that are running on the system.
3. At the command line, type one of the following commands:
v
If your system is running AIX, type
shutdown
v
If your system is running Linux, type
shutdown now -h
4. After you shut down the operating system, set the power switches of any attached devices to Off.
Stopping the System with an HMC Attached and AIX Installed
The HMC user interface provides a power-off function to turn off the power to the system.
AIX provides hot-swap procedures for adapters and devices that support hot-swap removal and
installation. Individual power components and fans can be serviced with the power on for power systems
equipped with redundant power and cooling. Before servicing the system, check removal, replacement,
and installation procedures.
If the system is running AIX, typing the shutdown command causes the system to shut down and power
off. The -F flag shuts down the system without warning system users. Check with the system administrator
before using this command. If you cannot use this method, you can power off the system by pressing the
power-on button on the operator panel or typing the appropriate command at the HMC.
Stopping the System with an HMC Attached and Linux Installed
The HMC user interface provides a power-off function to turn off the power to the system.
Linux does not provide hot-swap procedures for adapter and device removal and installation. The system
power must be turned off to service an adapter or device. Individual power components and fans may be
serviced with power on for power systems equipped with redundant power and cooling. Before servicing
this system, check removal and installation procedures.
If the system is operating under Linux, typing the shutdown now -h command causes the system to shut
down and power off. The -F flag shuts down the system without warning system users. Check with the
system administrator before using this command. If you cannot use this method, you can power off the
system by pressing the power-on button on the operator panel or typing the appropriate command at the
HMC.
Chapter 2. Removal, Replacement, and Installation Procedures
9