Crossroads Systems, Inc.

Alexander Kramer

Steven A Justiss

Linlin Gao

Embodiments of the present invention provide systems and methods for handling commands requesting movement of a data storage medium (magnetic tape, optical disk, or other medium) from a source media library to a destination media library using a pass through port. Prior to issuing commands requesting movement of the data storage medium from a source location to the pass through port and from the pass through port to a destination location, embodiments of the present invention can check the status of various locations (e.g., the destination location or pass through port) to determine if the movement requested in the original command can be completed successfully. Another embodiment of the present invention can maintain reservation flags for pass through ports so that the status of particular pass through ports can be determined and an available pass through port selected.

Method and system for handling commands requesting movement of a data storage medium between physical media libraries

According to one embodiment of the present invention, a controller that partitions a media library for multiple host applications can, for each partition, assign a base element address for an element type and associate physical element addresses for elements of an element type with an index value. For a partition, the logical element address corresponding to a physical element address for an element can be determined by adding the index number associated with the physical element address to the base element address for that element type. The physical element address corresponding to a logical element address for an element can be determined by subtracting the base element address for the element type from the logical element address for the element. The result of subtracting the base element address from the logical element address is an index value for which the associated physical element address can be found.

Growing community of inventors

Austin, TX, United States of America

Alexander Kramer