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Storage control apparatus and system for copying data to remote locations

  • US 10,209,919 B2
  • Filed: 04/05/2016
  • Issued: 02/19/2019
  • Est. Priority Date: 05/01/2015
  • Status: Active Grant
First Claim
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1. A storage control apparatus comprising:

  • a memory configured to store a copy-source reference count value and a copy-destination reference count value, the copy-source reference count value representing a number of reference sources for a copy target data unit stored in a copy-source storage apparatus, the copy-destination reference count value representing a number of reference sources in a copy-destination storage apparatus for a copy of the copy target data unit copied from the copy-source storage apparatus to the copy-destination storage apparatus; and

    a processor configured to perform a procedure including;

    transferring, when the copy-destination reference count value is one or more, a summary information piece of the copy target data unit to the copy-destination storage apparatus,transferring, when the copy-destination reference count value is zero, the copy target data unit to the copy-destination storage apparatus without transferring the summary information piece for the copy target data unit to the copy-destination storage apparatus,acquiring, from the copy-destination storage apparatus, a checked result obtained by checking the summary information piece against information stored in the copy-destination storage apparatus, andtransferring the copy target data unit to the copy-destination storage apparatus when the checked result indicates matching discrepancy.

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