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IPL (Initial Program Load)Types of IPL
How To Functions
The IPL types and modes A M Performs a Manual IPL from the A side of the disk. This mode may be
used when applying or removing Licensed Internal Code (LIC) PTFs.
It can also be used to power off the system.
Use this type and mode only under the direction of your support
representative.
A N Performs a Normal IPL from the A side of the disk.
This mode should only be used when B N does not work and you are
told to do so by your support representative.
B M Performs a Manual IPL from the B side of the disk. This mode should
only be used when an attended IPL must be performed or you need to
power off the system. This type of IPL is used when you need to change
the system date and time permanently.
B N Performs a normal IPL from the B side of the disk. This is the type
and mode used most of the time. It is also the mode the system must
be in if you want to do an unattended IPL.
C M Allows service representatives to perform a special IPL. This mode
is for use only by service representatives. Never IPL in this type
and mode.
C N Allows service representatives to perform a special IPL. This mode
is for use only by service representatives. Never IPL in this type
and mode.
D M Performs a manual IPL from either CD-ROM or tape. This mode is used
to install Licensed Internal Code and the OS/400 operating system in
attended mode. This is the most often used IPL type and mode for
installation.
D N Performs a normal IPL from either CD-ROM or tape. This mode is used
to install Licensed Internal Code and the OS/400 operating system in
unattended mode.
Manual When the mode is set to Manual (M), the system allows you to do all
manual IPLs, such as an operator-attended IPL from disk, CD-ROM or tape.
Manual mode also allows you to do some manual control functions, such
as selecting an IPL type and mode or displaying the kind of IPL that
the system is set to run. However, in manual mode, you cannot do a
remote IPL, an IPL by date and time, or an IPL after a power failure.
Note: You should set the mode to Manual only when it is necessary.
This ensures that no one accidentally presses the Power pushbutton
and causes the system to stop.
Normal The Normal mode allows you to turn the power on and then automatically
start the system in any of the following ways:
IPL remotely
IPL by date and time
IPL after a power failure
Note: Your system should be in Normal mode most of the time.
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