Unit names in cataloged procedures

UNIT=SYSDA
UNIT=VIO

Esoteric unit names are defined during system initialization and installation; the installation should maintain a list of esoteric unit names. Both these names may be defined as VIO (virtual I/O) data sets. See z/OS MVS JCL User's Guide for more information about VIO data sets.

All of the data sets that can be created use one of these esoteric units names. Most of these are set up as temporary data sets, and some are typically overridden to become permanent data sets, by using procedure parameters, or by overriding procedure statements. See Modifying cataloged procedures for more information about overriding statements in cataloged procedures.