VIRTUAL TAPE DEVICE AT ORIGINAL CENTER, VIRTUAL TAPE DEVICE AT DUPLICATE CENTER, VIRTUAL LIBRARY SYSTEM AND VIRTUAL TAPE CONTROL METHOD

摘要

A virtual tape device (10) of a virtual library system (100) carries out migration processing by which data memorized at a logical volume are stored at physical volumes in library devices (30a, 30b) that belong to its own devices in the case where the virtual tape device receives a data writing request as backup processing. Subsequently, when a host (20) notifies the virtual tape device (10) of an export instruction, the virtual tape device (10) exports the data stored at the logical volume where the migration processing has been finished to a physical volume in a duplicate center side library device (30c) through a network.