DIRECT BACKUP METHOD AND STORAGE DEVICE SYSTEM

摘要

PROBLEM TO BE SOLVED: To minimize write processing duration by backing up data by transmitting a designated block from a second volume to a magnetic tape unit when a command for copying the designated block from the second volume to the tape unit is received. SOLUTION: A host computer is provided with a means for issuing a CCOPY command for backing up all the data of backup objects stored on divided volumes to a secondary volume 6b continuously to a pair dividing command. On the other hand, a disk system is provided with a means for dividing a designated volume pair when the pair dividing command is received and a means for directly backing up a designated block 17 from the secondary volume 6b to a tape unit 3. Thus, data on the secondary volume 6b are frozen at the time point of pair division and the I/O issue load of the host computer can be reduced.