Today, as part of the automatic installation process, all nonconfigured disk units are added to the system auxiliary storage pool (ASP). If you are using automatic installation to upgrade from V5R2 and do not want nonconfigured disk units added, PTFs are available.
These PTFs allow you to set your disk configuration option. If you are upgrading from V5R2, an additional IPL is required for this to occur.
If you want to change your current disk configuration and you are upgrading from V5R2, follow the instructions to download and apply PTF SI08897. Prerequisite PTFs for Licensed Internal Code are included. The instructions also include how to change the disk configuration. You must be signed on as security officer (QSECOFR user profile) to use these PTFs to change the disk configuration option.
If you are currently on a V5R3 or V5R4 system, have already installed either of the disk configuration PTFs before you upgraded to V5R3, and are replacing the operating system, follow the instructions in Choosing disk configuration.