International Business Machines Corporation

Thomas Alan Bjork

Leon Edward Gregg

James Lawrence Tilbury

Armin Harold Christofferson

James Michael Van Oosbree

A method, apparatus and computer program product are provided for implementing autonomous variation of media dismount time in a robotic media library. I/O requests to the robotic media library are monitored. Performance statistics are gathered for the I/O requests to the robotic media library. The gathered performance statistics are periodically checked to determine if a change is needed for the media dismount time. The gathered performance statistics include a media hit count of where a data storage medium (DSM) for an I/O request is in a robotic media drive, and a media near miss count where the DSM for the I/O request is in transit from the robotic media drive.

Method and apparatus for implementing autonomous variation of media dismount time in a robotic media library

The present invention provides methods and systems for creating and manipulating universal disk format (UDF) data structures having variable amounts of data. For some embodiments, a UDF data structure is formatted with a freespace bitmap field large enough to represent a first amount of data and an area adjacent the freespace bitmap field reserved to allow the freespace bitmap field to expand to represent a second amount of data greater than the first amount of data. The freespace bitmap field may be expanded to represent the second amount of data by increasing a freespace bitmap size field to represent an expanded freespace bitmap field and initializing the expanded portion of the freespace bitmap size field.

Universal disk format volumes with variable size

A method, apparatus and article of manufacture for copying information from a first storage medium to a second storage medium. A first storage medium of memory blocks is mapped into at least one data block and at least one directory block. Two passes of the first storage medium are then performed. In the first pass, each data block is copied from the first storage medium to the second storage medium. If a read error occurs while copying a data block, a location of the data block and a data file stored in the data block are identified to provide future error handling capability. In the second pass, each directory block is copied from the first storage medium to the second storage medium.

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Rochester, MN, United States of America

Thomas Alan Bjork