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Zeroed block optimization in disk mirroring applications

  • US 20020073278A1
  • Filed: 12/13/2000
  • Published: 06/13/2002
  • Est. Priority Date: 12/13/2000
  • Status: Active Grant
First Claim
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1. A method for duplicating data written to a first storage device on a second storage device, the method comprising the steps of:

  • intercepting a write request directed to said first storage device, said write request including at least one data block; and

    for each data block included within said write request;

    examining said data block to determine if said data block contains only zero data;

    if said data block contains only zero data, sending a request to said second storage device to create a zeroed block; and

    if said data block contains non-zero data, transmitting said data block to said second storage device.

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