Installation processes

The system determines the type of installation process it uses based on available system resources and the type of product being installed.

A single-process installation is when licensed programs are installed one at a time (sequentially). A multiprocess installation is when the system starts multiple jobs to perform the installation of two or more licensed programs at the same time.

Licensed Internal Code and the base part of the operating system are always installed using single-process installation. Licensed programs (including libraries QGPL and QUSRSYS and optional parts of the operating system) can be installed using either single-process or multiprocess installation.

If you are installing only one licensed program, the system uses single-process installation. If you are installing more than one licensed program, multiprocess installation is used if system resources are available. If system resources are not available, single-process installation is used. A single-process installation is used when a system's main storage or auxiliary storage is limited and when a licensed program exceeds the requirements for multiprocess installation. For any set of licensed programs, if the system must use single-process installation, the installation takes longer.

Multiprocess installation

The operating system determines if your system configuration has enough system capacity to use multiprocess installation to install licensed programs. If your system has the required resources, the licensed programs are installed concurrently by doing the following tasks:

Loading the licensed program installation files from the media to temporary save files.
Using multiple batch jobs to concurrently install licensed programs from the save files. The save files are deleted during the installation process when they are no longer needed.

During installation, a status panel indicates the licensed programs that are currently being installed from save files. The display lists the licensed programs and the type of item being installed for each, as follows:

*PGM: Program objects
*LNG: Language objects

If your system does not have the required resources for a multiprocess installation, the licensed programs are installed sequentially from the installation media (single-process). In single-process installation, the status panel indicates the licensed program that is currently being installed from the media.