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Browse Prior Art Database

Enhanced Volume Location Index for Optical Libraries

IP.com Disclosure Number: IPCOM000101996D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 48K

Publishing Venue

IBM

Related People

Heise, TM: AUTHOR [+2]

Abstract

Described is a method of continually tracking volume movement in an optical library. It provides an accurate real-time indication of volume locations as they are moving, and eliminates the need to read the label of every volume in the library to reconstruct the volume location index after a failure during a move operation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 64% of the total text.

Enhanced Volume Location Index for Optical Libraries

       Described is a method of continually tracking volume
movement in an optical library.  It provides an accurate real-time
indication of volume locations as they are moving, and eliminates the
need to read the label of every volume in the library to reconstruct
the volume location index after a failure during a move operation.

      Each entry in the volume location index contains a Volume Move
Data Area (VMDA).  Before each move operation, information about the
move is recorded in the Volume Move Data Area, including the type of
move taking place and the destination each volume will occupy after
the move completes.  The current volume location (prior to the move)
is also retained until the move completes successfully.  The
information in the VMDA is used to determine the volume locations
that must be verified if a failure occurs during the move.  When a
move operation completes normally, the information in the VMDA is
cleared and the current volume location value in the index is set to
the volume's new location.

      If a failure occurs during a volume move, the information in
the VMDA is used to determine those volumes that were moving when the
failure occurred, if any.  Index information for volumes not being
moved is still correct. The VMDA is used to determine the number of
volumes being moved during the failure, and where these volumes are
currently located.  The moving volumes must be in...