For a description of RACF® considerations for opening nonlabeled tapes for input and output, see z/OS Security Server RACF Security Administrator's Guide.

You should be careful when using nonspecific volume requests for output volumes because the operating system assigns volume serial numbers and it is impossible for you to determine if the volume mounted is defined to RACF under a different number. If your installation plans to use RACF protection for nonlabeled tapes, you should use JCL scans to prevent the use of nonspecific volume requests and institute procedures to ensure that operators mount the correct tapes. In addition, the installation must activate the TAPEVOL class.