Powering Off and Powering On the System
This section provides procedures for powering off and powering on the system.
Powering Off the System
If the system is operating under AIX, type shutdown to power off the system.
If you cannot use this method, you can power off the system by using the following operator panel power
button procedure.
Attention: Using the primary I/O drawer operator panel power button to power off the system might
cause unpredictable results in the data files, and the next IPL will take longer to complete.
1. Open the rack door.
2. Press the power button on the primary I/O drawer operator panel.
The power LED on the primary I/O drawer operator panel starts blinking at a fast rate. B0FF displays in
the primary operator panel display.
When the power-off sequence is complete, the system goes into Standby mode, as evidenced by the
following:
v OK displays in the primary operator panel display.
v The primary I/O drawer operator panel LED will start blinking at a slow rate.
v The CEC drawer power LED will start blinking at a slow rate.
v If a secondary I/O drawer is present, its power LED will go off.
3.
Disconnect the ac power cords (dc power cords in a dc-powered system) from the drawers.
Powering On the System
To power on the CEC drawer and attached I/O drawers, do the following:
1. Open the rack door. Look for OK in the primary operator panel display, which indicates that the system
is in Standby mode.
2. Press the power button on the primary I/O drawer operator panel.
The
power LED on the primary I/O drawer operator panel starts blinking at a fast rate. 9xxx checkpoints
appear in the operator panel display.
When the power-on sequence is complete:
v The power LED on the primary I/O drawer operator panel stops blinking and stays on.
v The power LED on the CEC drawer stops blinking and stays on.
v If a secondary I/O drawer is present, its power LED comes on and stays on.
Powering Off and Powering On the System Using the Service
Processor
The system can be powered off and on using the System Power Control menu, which is a service
processor menu that is available to the privileged user. See “System Power Control Menu” on page 368.
Chapter 10. Removal and Replacement Procedures 415
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