When using db2setup to install a 64-bit AIX DB2 image on an existing AIX operating system, ensure that you are using compatible AIX versions or the installation will fail. AIX Version 5 DB2 images cannot be installed on an existing AIX Version 4 operating system. Similarly, the installation of a 64-bit AIX Version 4 DB2 image on an existing AIX Version 5 operating system will also result in an installation error.
When attempting to install incompatible 64-bit AIX versions, the db2setup utility finds the version mismatch on a prerequisites check resulting in an error message such as the following:
DBI1009E Install media and AIX version mismatch.
To avoid this error, ensure that you are installing the correct 64-bit AIX version.
If you use SMIT, you will receive an error for AIX Version 4 DB2 being replaced by AIX Version 5 DB2, however, the reverse does not occur. Therefore, 64-bit AIX Version 5 users should ensure that they are installing the correct version. If db2setup can be launched, without an error message, then the checking of AIX version compatibility was successful.