Patent ID: 7085904
Filing Date: 2006-08-01
Classification: G06F,Y10S

Abstract:
1. A storage system comprising: a disk controller which has a CPU, a main memory, and an interface; and a disk device which has original volumes for backup and a storage pool for backup data, wherein the main memory incorporates a differential management program which checks whether the original volumes for backup are updated or not, a pool management program which allocates a disk area for storage of backup data to the storage pool for backup data, a performance management program which manages the performance of each volume of the disk device, and a backup control program which issues an instruction to the differential management program, the pool management program, and the performance management program for total backup control, wherein the backup control program selects a backup method by which recovery within a user-specified recovery object time is possible, according to a restore performance calculated by the performance management program and the total size of changed blocks after backup acquisition as counted by the differential management program, wherein the performance management program maintains a performance management table which is used to manage disk and volume performance and calculate the restore performance, wherein the performance management table includes for each volume at least a Redundant Array of Inexpensive Disks (RAID) configuration which constitute said volume, information indicating a read performance of said volume, and information indicating a write performance of said volume, and wherein the restore performance is calculated based on at least the RAID configuration, read performance and write performance of each volume.