Patent ID: 8112598
Filing Date: 2012-02-07
Classification: G06F

Abstract:
1. A copy controlling apparatus to produce a snapshot indicating a backup target volume at a time point of an execution of a backup operation each time the backup operation is performed, the copy controlling apparatus comprising: a copy unit configured to copy pre-update data on the backup target volume in a first storage device into a second storage device on the basis of an update instruction upon receiving the update instruction of data in the backup target volume in the first storage device subsequent to the time point of the execution of the backup operation; a memory configured to store a management table configured to relate a copy status with position information indicating a position of the data in the backup target volume at each time point, the copy status indicating whether the pre-update data indicated by the position information is copied into the second storage device by the copy unit; a data determiner configured to search the position information indicating the position of bad data indicating unreadable data using the management table upon the bad data being present in the backup target volume, and to determine on each of the position information indicating the position of the bad data whether the pre-update data corresponding to the bad data is stored in the second storage device on the basis of the copy status related with the position information; and a time point determiner configured to search the management table for the position information indicating the position of the bad data when the bad data is present in the backup target volume, and to determine at each time point in accordance with the copy status related with the position information whether the pre-update data of the bad data is stored in the second storage device with respect to all the position information indicating the bad data.