In general, tape users do not require any RACF access authority to the VOLCAT. During job processing, the updates to the VOLCAT are made by authorized system users. However, the VOLCAT still needs a data set profile and should be defined with UACC(NONE). Storage administrators using ISMF should have READ access to STGADMIN.IGG.LIBRARY and IDCAMS users should have an access level to STGADMIN.IGG.LIBRARY appropriate to the function being performed. For the required RACF access level when using IDCAMS, refer to "Required Security Authorization for VOLCAT Operations" in z/OS DFSMS Access Method Services Commands.