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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 the shutdown command 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:
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 appears 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 from the drawers.
Powering On the System
Perform the following steps to power on the CEC drawer and attached I/O drawers.
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 378.
Using the primary I/O drawer operator-panel power button to power off the
Chapter 9. Removal and Replacement Procedures
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