Transferring data in a digital data processing system

  • US 5,247,618 A
  • Filed: 05/11/1992
  • Issued: 09/21/1993
  • Est. Priority Date: 06/30/1989
  • Status: Expired due to Term
First Claim
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1. A method of transferring data between two storage media in a shadow set of storage media accessible by one or more hose processors for I/O requests, said method comprising the steps of:

  • A. receiving a command from one of said host processors, said command specifying data to be transferred from a first said storage medium to a second said storage medium;

    B. transferring said data specified in said command from said first storage medium to said second storage medium in a series of subtransfers, each of said subtransfers transferring a portion of said specified data; and

    C. processing one or more I/O requests received from said host processors for access to said shadow set by, for each received I/O request;

    a. implementing said I/O request if said I/O request does not involve a section of said shadow set currently involved in one of said subtransfers; and

    b. stalling said I/O request if said I/O request involves a section of said shadow set currently involved in one of said subtransfers, and implementing said I/O request when said one of said subtransfers has completed.

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