IBM pSeries 670, Service Manual

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Powering Off 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. If the system is
logically partitioned, Linux may be stopped individually in each partition to make repairs. If the system
power must be turned off, all of the logical partitions must be stopped. Linux does not provide hot-swap
procedures for adapter and device removal and installation. You must shutdown all partitions and 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. Check
removal and installation procedures before servicing this system.
As the system goes off, the power LED on the 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
message displays in the operator panel display.
v The operator-panel LED will start blinking at a slow rate.
v
The processor subsystem power LED will start blinking at a slow rate.
To completely remove power from the system, turn off the UEPO switch, turn off the circuit breakers on all
optional IBF subsystems (if provided), then disconnect both power cords from the customer’s receptacle.
If the system is operating in a full system partition 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 button on the operator panel or the
appropriate command at the HMC.
Attention: 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.
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pSeries 670 Service Guide