INTER-DISK COPY PROCESSOR AND COPY PROCESSING METHOD AND PROGRAM ALLOWING THE SAME METHOD TO BE PERFORMED BY COMPUTER AND COMPUTER READABLE RECORDING MEDIUM WITH ITS PROGRAM RECORDED

摘要

PROBLEM TO BE SOLVED: To efficiently preserve plural generations in a logical disk, and to quickly copy and preserve data in an external another medium. SOLUTION: A copying processing part 4 performs the intensive copy of difference data stored in plural areas scattered on a logical disk 1 being the origin of copy in consecutive areas on a logical disk 2 being the destination of copy, and when a request for access to the logical disk being the origin of copy or the logical disk being the destination of copy is generated during the intensive copy processing, the intensive copy processing is interrupted, and access processing is performed by an access processing part 5.