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Virtual storage and block level direct access of secondary storage for recovery of backup data

  • US 6,269,431 B1
  • Filed: 08/13/1998
  • Issued: 07/31/2001
  • Est. Priority Date: 08/13/1998
  • Status: Expired due to Term
First Claim
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1. A method of permitting at least one host processor to obtain from a data storage subsystem access to backup versions, the data storage subsystem having primary data storage, the backup versions being stored in secondary data storage linked to the data storage subsystem for transfer of the backup versions from the secondary data storage to the data storage subsystem, said method comprising:

  • a) the host processor transmitting to the data storage subsystem a request for assignment of a virtual storage address from which a specified backup version in the secondary data storage can be accessed via storage access requests that are transmitted from the host processor to the data storage subsystem;

    b) the data storage subsystem responding to the request for assignment of a virtual storage address by assigning a virtual storage address from which the specified backup version in the secondary data storage can be accessed via storage access requests that are transmitted from the host processor to the data storage subsystem;

    c) the host processor accessing the specified backup version by transmitting to the data storage subsystem storage access requests that specify the assigned virtual storage address and that specify portions of the specified backup version to be accessed; and

    d) the data storage subsystem responding to the storage access requests by accessing the specified portions of the specified backup version to be accessed.

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