To upgrade from one release of AIX to another (such as from AIX 7.1 to AIX 7.2), the recommended method is a Migration Install. This method allows the administrator to upgrade the operating system while preserving existing data and settings. It updates the existing AIX installation to the new version, ensuring compatibility and continuity of system configurations and installed applications. The other methods, such as Preservation Install, New and Complete Overwrite Install, and Update Install, are either not suitable for upgrading to a new release or would result in data loss or incomplete updates.References:= IBM AIX Documentation
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