Patent ID: 7062621
Filing Date: 2006-06-13
Classification: G06F,Y10S

Abstract:
1. A backup method for a storage system, wherein said storage system comprises a disk controller, an original volume storing data to be backed up, and a storage pool including storage areas to be used for storing backup data, comprising the steps of: setting a target recovery time and a target recovery point from a management console to said storage system; preparing a backup volume from storage areas in said storage pool; executing initial full backup copy from said original volume to the prepared backup volume; when a condition specified by said target recovery point is satisfied, calculating estimated restore time to restore data in said original volume from backup data for each of plural backup methods; selecting one backup method from said plural backup methods, said target recovery time is satisfied by using the selected backup method; and executing backup copy according to said selected backup method, wherein said storage system maintains a performance management table which is used to manage disk and volume performance and calculate the restore time, 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 time is calculated based on at least the RAID configuration, read performance and write performance of each volume.