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Method for controlling storage system, and storage control apparatus

  • US 7,051,121 B2
  • Filed: 04/25/2003
  • Issued: 05/23/2006
  • Est. Priority Date: 04/26/2002
  • Status: Expired due to Fees
First Claim
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1. A method for controlling a storage system including a host computer, and a first and a second storage control apparatuses each having a function for receiving a data input/output request transmitted from said host computer and executing a data input/output process for a storage device in response to said data input/output request received, comprising:

  • connecting a first communication path between said host computer and said first storage control apparatus;

    connecting a second communication path between said first storage control apparatus and said second storage control apparatus;

    receiving by said first storage control apparatus a first data input/output request transmitted from said host computer through said first communication path;

    when said first storage control apparatus has judged that said first data input/output request is not to be handled by said first storage control apparatus, transmitting by said first storage control apparatus a second data input/output request corresponding to said first data input/output request, to said second storage control apparatus through said second communication path;

    receiving, by said second storage control apparatus, said second data input/output request and executing a data input/output process corresponding to said second data input/output request received;

    said first and said second storage control apparatuses each organizing one or more logic volume(s) on a storage area provided by a storage device for which said first and said second storage control apparatuses execute respective data input/output processes;

    when said first storage control apparatus has received from said host computer a data write-in request of new data to said first logic volume for which said first storage control apparatus executes data input/output processes, transmitting by said first storage control apparatus said data write-in request of the new data to said second storage control apparatus without writing the new data to said first logic volume;

    receiving, by said second storage control apparatus, said data write-in request and writing the new data to said second logic volume for which said second storage control apparatus executes data input/output processes;

    transmitting by said second storage control apparatus to said first storage control apparatus the storage position of the new data in said second logic volume; and

    storing in said first storage control apparatus the storage position in said first logic volume which is the write-in destination of the new data, and the storage position in said second logic volume of the new data transmitted, correlating the two storage positions with each other.

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