You can prevent identically named data sets from being defined to RACF® with separate, discrete profiles by modifying the installation-replaceable module ICHSECOP. For information on modifying ICHSECOP, see z/OS Security Server RACF System Programmer's Guide.

If you disallow duplicate data set profile names, data sets with the same name must be defined to RACF for protection in one common discrete profile with multiple volume serials. In this case, a data set shares the data set profile (including the access list, and statistics and logging options) with other data sets that have the same name.

Note that a fully qualified generic profile can also be used to protect data sets with identical names, regardless of which volumes they reside on.