The following key terms are used to describe the Express Upgrade process:
Old Environment - This is the old version IOA environment that serves the production systems.
New Environment - This is an environment that will become the new version IOA production environment upon a successful completion of the upgrade process.
Compatibility Mode - In this mode, the newly installed new version environment uses the repository data sets and operation libraries from the original production environment. This is possible because it does not use new features that are not compatible with the older version production environment. Fallback is only possible in this mode.
Adaptation - The process during which the repository data sets and operation libraries that were installed together with the New Environment are disconnected from the New Environment, and the repository data sets and operational libraries of the Old Production Environment are connected to the New Environment. From this point, the merger of the newer version runtime environment with the existing production repository data sets is called the Adapted Environment.
Adapted Environment - When the New Environment and older version production environment are configured to share the same production data sets and operation libraries, the New Environment is also called the Adapted Environment.
Incompatibility Mode - In this mode the newly installed environment uses new features that are not compatible with the older version. Once the products are switched from Compatibility Mode to Incompatibility Mode, and activated, then switching them back to the Compatibility Mode using the FALLBACK process is no longer possible.
Site Libraries - This term refers to two libraries outside of the IOA environment, which are pointed to by the SITEPROC and PROCLIB ICE parameters. The libraries contain, respectively, the Procedures and Started Tasks (STC JCLs) of the INCONTROL products, which are copied to the libraries during the Installation and Upgrade processes.
First Three Characters - This term refers to first three characters of Procedures and Started Tasks names which the user defines during the Installation and Adaptation processes.
