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6 CATIA and Enova migration AIX 4.3 to AIX 5L Version 5.1
2.1 Definition of migration
The term migration is defined in the information technology field as the change of one
operating environment for another. This can involve moving to new hardware, to new
software, or both.
In the way it is used in this document, migration is defined as an upgrade of an operating
system (OS), but although the words upgrade and migration are often used interchangeably,
there is a difference:
An
upgrade refers to an addition to an existing system. This could be the installation of a
Programming Temporary Fix (PTF) or maintenance level within a particular release of AIX.
The term
migration for this document means to move the software of a system
environment from one AIX version or release to a different one; in our case, from AIX
Version 4.3 to AIX 5L Version 5.1.
The new OS version that is installed replaces the existing operating system, removing
software that is no longer used and installing new software that enhances the usability of
the upgraded system. The new release also provides a new revised kernel. AIX 5L
provides either 32-bit or 64-bit kernels.
The difference between a migration and a complete overwrite installation is that the root
volume group is kept with all of its file systems except /tmp, which is deleted and rebuilt while
migrating.
There is a third way to install the operating system, which is the preservation installation. It
only keeps the /home directory with the user files but overwrites the other file systems of the
root volume group.
2.2 Reasons to migrate
This section is intended to answer the first question you should ask when we try to convince
you to migrate to AIX 5L:
“This sounds like a lot of work and expense. Why should I? What’s in it for me?”
The answer has two parts:
If your environment is stable and you do not intend to make any changes or additions
whatsoever in the future, you could stay with your current version of AIX. But, if you want
to take advantage of the new AIX 5L function, such as online backups, a migration is worth
it.
Since AIX 4.3.3 was withdrawn from marketing (WDFM) in June 2003 and from service
(WDFS) December 31, 2003, there is a valid reason to migrate in a CATIA or ENOVIA
environment. After December 31, 2003 there is no direct method to receive defect
support.
2.3 Migration methods
The following section describes the various migration methods and their advantages and
disadvantages. To provide a complete overview about the migration methods, we also
describe the preservation installation. Based on our customer experiences, we see the
migration installation or new and complete overwrite installation as the preferred methods to
move to AIX 5L.