BTLS

BTLS (Batch Terminal Library Support) was IBM software designed to support IBM 3494 and 3495 Automated Tape Libraries (ATL) not managed by DFSMS. The main system components included the control program, the device driver, and the operator interface. These components communicated using z/OS system services and proprietary protocols over ESCON channels.

BTLS automated tape library functions, including tape volume management, robotic control, and host-initiated operations, aiming to reduce manual intervention and improve operational efficiency. Configuration involved defining the tape library layout, drive characteristics, and mapping logical volumes to physical tapes. Basic operations were performed using commands such as `MOUNT TAPE(volser) DRIVE(drive_address)`.

BTLS relied on z/OS security features for authentication and access control, typically through RACF, ACF2, or Top Secret, providing role-based access control (RBAC). It used configuration files to define tape library configurations. Integration was achieved through custom programming using z/OS system services.

BTLS has been superseded by DFSMS and other modern tape management solutions like CA 1 Tape Management and Control-M Tape, which offer enhanced features, better integration, and improved security. Unlike modern solutions, BTLS did not expose standard APIs like REST or SOAP, limiting integration options. Modern solutions also offer enhanced monitoring and logging capabilities, providing better visibility into tape operations.