Software upgrade or replacement

 

Use this information to understand special considerations of the system and its software when you upgrade or replace an i5/OS^® release.

• Supported releases and nonsupported models for i5/OS (OS/400) upgrades
  Upgrades to current releases require that you be at a certain level of software. This information shows the supported combinations for source and current target releases.

• Installation and IBM-supplied objects
  When you replace your software with a new i5/OS release, by default the system keeps changes that you made to some IBM-supplied objects.

• Compressed objects and storage space
  All of the licensed programs and some objects of the i5/OS operating system ship in a compressed form. This requires less storage space on your system. The system decompresses objects according to certain criteria, which could affect the performance of the system.

• Files that the system deletes during installation
  If you have created logical files over IBM-supplied physical files in QSYS, the logical files will be deleted during the i5/OS installation process.

 

Parent topic:

Concepts for software installation