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• If your system is running the IBM i operating system, type PWRDWNSYS. If your system is partitioned,
use the PWRDWNSYS command to power off each of the secondary partitions. Then, use the
PWRDWNSYS command to power off the primary partition.
The command stops the operating system. Choose from the following options:
• If the system power turns off, the power-on light begins to slowly flash, and the system goes into a
standby state, continue with step "5" on page 16.
• If your system does not power off when the last partition powers off, continue with step "3" on page
16.
3. Open the front rack door, if necessary.
4. Hold the power button (A) on the control panel, as shown in the following figure. The control panel
shows a countdown from 4 to 0. After the countdown is complete, release the power button.
The system power turns off, the power-on light begins to slowly flash, and the system goes into a
standby state.
Figure 3. Control panel LEDs
5. Record the IPL type and the IPL mode from the control panel display to help you return the system to
this state when the installation or replacement procedure is completed.
6. Set the power switches of any devices that are connected to the system to off.
Stopping a system by using the ASMI
You might need to stop the system to complete another task. If your system is not managed by the
Hardware Management Console (HMC), use these instructions to stop the system by using the Advanced
System Management Interface (ASMI).
Procedure
1. Log in to the host partition as a user with the authority to run the shutdown or pwrdwnsys (Power
Down System) command.
2. On the command line, enter one of the following commands:
• If your system is running the AIX operating system, type shutdown.
• If your system is running the Linux operating system, type shutdown -h now.
16 Power Systems: Common procedures for installable features
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