Abstract: A high input/output (I/O) capacity, multi-frame storage subsystem, method of inserting/ejecting storage media in the storage subsystem and program product therefor. The storage media, e.g., magnetic tape in a physical volume, is placed into storage cells in a service bay before being inserted into the subsystem library or after being ejected from a data library in the subsystem. Whenever the service bay door is opened, the accessor is prevented from entering the service bay and tape cartridges may be inserted in the service bay storage cells or removed from the storage bay storage cells without pausing the subsystem.

Abstract: A device, method, and system for switching library managers of a data library while maintaining data library storage devices online. A library manager accepts and executes data transaction commands for access to data residing on the storage devices of the data library. A transition manager module receives a directive to transition library management functions from a first library manager to a second library manger. The transition manager module stops the first library manager from accepting new data transaction commands while maintaining the storage devices online. The first library manager may execute previously accepted data transaction commands. The transition manager module suspends the library management functions of the first library manager and activates the library management functions of the second library manager. The storage devices of the data library may complete data transaction commands throughout the library manager transition.