For z/OS ServerPac customers, IBM® delivers a single root file system. This file system is unloaded when you do "Establishing UNIX Services" in the ServerPac installation process. Not only does the single-root file system make cloning of file systems easier, but it also dramatically reduces the number of jobs run by system programmers to establish z/OS UNIX.

Requirement: Performing ServerPac installation requires that you be a superuser with UID(0) or have access to the BPX.SUPERUSER resource in the FACILITY class. See Security requirements for ServerPac and CBPDO installation for a complete description of the security requirements necessary to perform your ServerPac instal

The information that IBM products keep within /var is not intended for you to directly edit or modify. It is for IBM use only. Like /etc, IBM products create directories under /var during installation. Unlike /etc, IBM products (during execution or customization) also create files in /var. However, IBM products do not install files into /var during the SMP/E installation.

IBM also delivers a separate file system for /etc. See Establishing an /etc file system for a new release.