If you are using automatic installation to upgrade and do not want nonconfigured disk units added, PTFs are available that enable you to set your disk configuration option.
If you are upgrading from V5R2 to V5R4 and want to change your disk configuration, refer to the instructions in the topic Installing optional PTF to choose disk configuration.
If you are currently on a V5R3 or V5R4 system and are replacing the operating system, do the following to keep your current disk configuration: