Inventors:
David G. Beal - Tucson AZ, US
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G06F 17/00
Abstract:
A data structure, method, and computer system for fast data copy is provided which uses control structures in a data copy track table. The control structures include a physical location pointer, a physical location pointer flag, a forward track pointer and a backward source pointer. These control structures are used in an update-in-place architecture. Requests for source or target data updates do not require additional write cycles.