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Storage system and method for backup

  • US 7,085,904 B2
  • Filed: 02/20/2004
  • Issued: 08/01/2006
  • Est. Priority Date: 10/20/2003
  • Status: Expired due to Fees
First Claim
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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, andwherein the restore performance is calculated based on at least the RAID configuration, read performance and write performance of each volume.

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