DFSMSdss allows data sets with a high-level qualifier of SYS1 to be dumped, deleted, and uncataloged. You must use the PROCESS(SYS1) keyword with the DUMP command. The SYS1.VVDS and SYS1.VTOCIX data sets are an exception to this processing.

SYS1.VVDS and SYS1.VTOCIX data sets can be physically, but not logically, dumped. Also, the SYS1.VVDS data set cannot be deleted or uncataloged.

Guideline: To limit the use of the PROCESS keyword, it is recommended that the PROCESS keyword be protected by a security program, such as RACF®.

For more information about the RACF FACILITY class profile, refer to z/OS Security Server RACF Security Administrator's Guide.