IBM pSeries 690 Service Manual page 873

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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 button on the operator panel or the

appropriate command at the HMC.

Using the power 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 IPL will also take longer to complete if

all applications in all partitions are not stopped beforehand.

Powering the System On

The system can be powered on after all of the following steps have been completed:

v All I/O drawer cables are connected

v UPIC cables are connected

v All PCI cables to supported subsystems are connected

v The hardware management console (HMC) is connected

v Power is connected to the system and the UEPO switch is set to On

After the required cables are installed, and the power cables are connected, the HMC graphical user

interface provides a power-on function to turn on the power to the system. The power button on the media

subsystem operator-panel can be pushed to initialize the system, but the preferred method is to use the

HMC. Progress indicators, also referred to as checkpoints, are visible on the media subsystem operator

panel display as the system power is turned on. The power LED on the media subsystem stops blinking

and stays on, indicating the system power is on.

The processor subsystem and I/O subsystems are powered on through the system power control network

(SPCN). When power is applied, the power LEDs on the media subsystem go from blinking to on

continuously, and the power LEDs on the processor subsystem and I/O subsystem(s) come on and stay

on. This indicates that power levels are satisfactory in the subsystems.

Powering On the System Using the Service Processor

The system can be powered on using the System Power Control menu, which is a Service Processor

menu that is available to the privileged user.

Chapter 9. Removal and Replacement Procedures