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Data transferring system having foreground and background modes and upon detecting significant pattern of access in foreground mode to change background mode control parameters

  • US 5,896,548 A
  • Filed: 02/28/1997
  • Issued: 04/20/1999
  • Est. Priority Date: 09/01/1995
  • Status: Expired due to Term
First Claim
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1. A method for transferring blocks of data elements from storage locations in a first data storage device to storage locations in a second data storage device wherein a host computer generates data transfer requests for data elements from arbitrary storage locations in the second data storage device, said method comprising the steps of:

  • A. defining a copy subroutine for effecting the transfer of data blocks in response to predetermined control parameters;

    B. enabling a background mode controller to establish the predetermined control parameters for the copy subroutine;

    C. enabling a foreground mode controller to make transfers of a data block in response to a data transfer request that accesses a data block located only in the first data storage device;

    D. determining the existence of a significant pattern of accesses in response to data transfer requests from the host computer; and

    E. altering the predetermined control parameters for the background mode controller in response to the occurrence of the significant pattern.

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