Init Phase; Maintenance Phase; Boot Phase; Run-Time Phase - IBM R30 Operator's Manual

Init Phase

Init phase is entered when the power button on the Operator Panel is pressed on or when
the power-on command is entered on the BUMP Console or Service Console.
If the System Key is in Normal mode, the BUMP runs the built-in or resident power-on
(PON)-tests on the CPU module hardware, IPLs on the first available processor, runs the
functional power on self-tests (POST) on the I/O subsystem to check the system, and finally
loads the AIX operating system.
If the System Key is in Service mode, and if several conditions are met, the system loads
the SystemGuard MAINTENANCE MENU. These conditions are: the Autoservice IPL flag
disabled, the BUMP console enabled, and a Valid Service Contract.
If the System Key is in Secure mode, the system enters the Stall state, and the LCD
displays the three-digit code 200. The initialization of the system stops until the Physical Key
is set to Normal or Service. The Stall state is exited, and control of the system is passed to
AIX.

Maintenance Phase

The maintenance phase is entered from the Init phase if the system key is in service mode.
If the BUMP console present flag is set, the MAINTENANCE MENU is displayed on the
BUMP console, and the system waits for an operator action. The maintenance menu
choices are described on page 3-21. Various maintenance tasks can be performed from this
menu. When maintenance tasks are complete, the system can be booted, powered down, or
reset.

Boot Phase

SystemGuard enters the Boot phase from either the Init phase or the Maintenance phase. In
this phase the system is initialized and control of the system is passed to the operating
system. Control of the two serial ports is switched to the operating system and the Run-Time
phase is entered. If a valid boot block is not found and the system key is set to Service,
SystemGuard returns to the Maintenance phase.

Run-Time Phase

This is the phase where the AIX operating system is in control of the system. The Run-Time
phase is entered once the AIX operating system is loaded and takes control of the consoles.
When AIX is stopped again, for example due to a shutdown, the system goes back to the
Stand-By phase.
3-5
Using SystemGuard