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Chapter 2: Installation > Introduction - Pg. 48

2.1 Introduction z/OS UNIX System Services is a base element and exclusive feature of the z/OS operating system. This chapter does not discuss installation of the z/OS operating system, but it may highlight z/OS installation information where it specifically relates to z/OS UNIX. Note: Starting with the September 2004 z/OS release (V1R5), IBM intends to deliver z/OS and z/OS.e releases annually. Since z/OS UNIX is part of the z/OS operating system, the first prerequisite for using z/OS UNIX is to have a z/OS system available. Such a system should have the general z/OS installation work completed, and be either already IPLed, or ready to be IPLed. It is assumed that a root file system already exists and is populated with the elements that were created as part of the z/OS installation process. The topics that follow only focus on the activities necessary to activate (meaning enable , or implement --terminology for separation from the SMP/E installation process that is outside the scope of this book) the z/OS UNIX components within the z/OS operating system. The sequence of topics is: Activating z/OS UNIX in minimum mode . Minimum mode is activated if there is no requirement to exploit z/OS UNIX. This might be suitable for a system that only runs traditional MVS workloads. Note that if you want to use any z/OS UNIX service, TCP/IP, or other functions that require the kernel services, then full function mode is required. This is also the case if service is to be applied to the HFS. Activating z/OS UNIX in full function mode . Full function mode is activated if there is a requirement to exploit z/OS UNIX. This might be suitable for a system that runs UNIX