The library manager (Figure 1, item  3 ) is a licensed internal code application installed in the library controller that controls all operations in the tape library. The library manager controls tape library automation, communicates with the host through each control unit, and allows communication paths for operators and service personnel. The library manager is also used for service and test sessions and provides operator status information and control panels for the operator’s use. Transaction logs and an error log are also provided as problem determination aids. For more information concerning the library manager for the 3495, see the 3495 Tape Library Introduction and Planning Guide .

Commands are processed by the library manager and translated into requests for cartridge movement or database processing. The library manager database provides a cross-reference between a volume serial number, a volume’s actual storage location, and a volume’s category. See Displaying tape volume status for a list of valid volume categories and their descriptions.