What you need to install High Level Assembler

This section identifies the system requirements for installing High Level Assembler. You need to plan for two different system environments:
  • Target system—the system comprising the set of libraries that are updated by SMP/E and system utilities during installation
  • Driving system—the system on which the jobs are run to install the program
The machine-readable components for High Level Assembler are installed in target and distribution libraries.
  • Target libraries are the data sets in which the run-time copy of High Level Assembler is stored. These data sets include the executable program code and any other components used during execution, such as sample JCL and messages.
  • Distribution libraries are the data sets in which additional copies of these components are stored. The copy of High Level Assembler kept in the distribution libraries can be kept at a different service level than that in the target libraries. SMP/E can reconstruct the target libraries in whole or in part from the distribution libraries. Therefore, service or user modifications can be removed from the run-time copy of High Level Assembler

In many cases, the same system can be used as both a driving system and a target system. However, you may want to set up a clone of your system to use as a target system by making a separate IPL-able copy of the running system. The clone should include copies of all system libraries that SMP/E updates, copies of the SMP/E CSI data sets that describe the system libraries, and your PARMLIB and PROCLIB.

Some cases where two systems should be used include the following:
  • When installing a new level of a product that is already installed, the new product will delete the old one. By installing onto a separate target system, you can test the new product while still keeping the old one in production.
  • When installing a product that shares libraries or load modules with other products, the installation can disrupt the other products. Installing onto a test system or clone will allow you to assess these impacts without disrupting your production system.