IBM pSeries 670, Service Manual

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Powering Off and Powering On the System
This section provides procedures for powering off and powering on the system. If you are instructed to
remove the power from the system, the power cords must be disconnected from the power source.
Powering Off the System With an HMC Attached and AIX Installed
The HMC user interface provides a power-off function to turn off the power to the system. If the system is
logically partitioned, AIX in each partition may be stopped individually to make repairs. If the system power
must be turned off, all of the logical partitions must be stopped. AIX provides hot-swap procedures for
adapters and devices that support hot-swap removal and installation. You do not have to shutdown a
partition that controls an adapter or device that supports hot-swap. 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 the 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 AIX, typing the shutdown 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 before hand.
Chapter 9. Removal and Replacement Procedures
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