Changing the system during IPL (attended IPL)

Prerequisites

This procedure assumes that the system is running, and requires that several additional conditions be met before you begin an initial program load (IPL). Most of these settings are the default values, but you must verify them if you are unsure of the current setting.

• The IPL mode for the system must be set to Manual (attended IPL).
• The Type of restart (QIPLTYPE) system value must be set to attended (1).
• Turn on any devices, such as display stations, printers, tape devices, and controllers that you or others want to use.

Situation

If you want to change IPL options, install the operating system, use dedicated service tools, work with logical partitions, or recover from a system failure, you need to perform an attended IPL. This IPL mode requires that you respond to several prompts during the startup sequence.

Performing an attended IPL

Enter different options on the command line to perform an attended IPL.

1. Type ENDSYS or ENDSBS *ALL on any command line and press Enter.
   Note: More options are available for the End System (ENDSYS) and the End Subsystem (ENDSBS) commands, for example, to set delay time.
2. Type WRKSBS to verify that the controlling subsystems have ended and are in the restricted state. The subsystems status must be RSTD.
3. Type PWRDWNSYS *IMMED RESTART(*YES) on any command line and press Enter.

After you begin the attended IPL, the system displays the IPL options display where you can choose which options you want to work with during the IPL. During the IPL, the system displays any options that you selected, or that are required due to system changes.