You issued an RMM TSO subcommand against a system-managed volume and DFSMSrmm needs to know if the library is a VTS. DFSMSrmm attempts to process the subcommand without the need to know if a volume is a logical volume or physical volume or in a virtual tape server library. Some requests require this information. Therefore the library must be correctly configured. The system obtains the required information at IPL time and at ACTIVATE IODF, and requires at least one tape drive operational.