| 摘要 |
PROBLEM TO BE SOLVED: To reduce a network load in backup of data of a virtual disk and suppress compression of a disk area of computer virtualization processing. SOLUTION: A virtual-side data backup processing part 121 acquires and records a block position of data from a computer virtualization processing part 120 to generate update position information 122 when the processing part 120 writes the data to a virtual-side data file 131, and retrieves, upon input of a backup instruction signal, the update position information 122 to search whether data of a block unit written in the virtual-side data file 131 is present or not. When the data is present, the processing part 121 clears a record of block position corresponding to the present data from the update position information 122, reads data of the cleared block position from the file 131 based on the block position, and transmits the data and the block position of the data to a backup server 200. COPYRIGHT: (C)2009,JPO&INPIT
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