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Computer data storage physical backup and logical restore

  • US 6,366,987 B1
  • Filed: 08/13/1998
  • Issued: 04/02/2002
  • Est. Priority Date: 08/13/1998
  • Status: Expired due to Term
First Claim
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1. In a data processing system including a primary data storage subsystem and a secondary data storage subsystem, a method of backing up and restoring a file, said method comprising:

  • a) in response to a back-up request specifying the file, selecting a storage unit containing the file, and sending a backup command to the primary data storage subsystem for backing up the storage unit by copying a current version of the storage unit from primary storage in the primary data storage subsystem to the secondary data storage subsystem to create a backup version of the storage unit in secondary storage in the secondary data storage subsystem, and b) in response to a restore request specifying a particular version of the file contained in the backup version of the storage unit in the secondary storage in the secondary data storage subsystem, issuing a restore command to the primary data storage subsystem for fetching the backup version of the storage unit containing the particular version of the file and writing the backup version of the storage unit from the secondary storage to spare data storage, and extracting the file from the spare data storage by performing a logical-to-physical translation to identify storage components of the file in the spare data storage, and by copying the storage components of the file from the spare data storage to create a current version of the file in the primary storage of the primary data storage subsystem.

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