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Method for controlling storage system, and storage control apparatus

  • US 7,457,899 B2
  • Filed: 01/25/2006
  • Issued: 11/25/2008
  • Est. Priority Date: 04/26/2002
  • Status: Expired due to Fees
First Claim
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1. A first storage control apparatus adapted to be coupled to a second storage control apparatus comprising second plurality of storage devices and executing data read/write processes to said second plurality of storage devices based on a Redundant Array of Independent Disks (RAID) scheme, said first storage control apparatus comprising:

  • a cache memory;

    a first plurality of storage devices;

    said first storage control apparatus receiving a first data write request, storing first data corresponding to said first data write request in said cache memory, transmitting a first completion notice of said first data write request, and executing a data write processes of said first data stored in said cache memory to said first plurality of storage devices provided with a first logical volume, having a first Logical Unit Number (LUN), of said first storage control apparatus; and

    said first storage control apparatus receiving a second data write request, storing second data corresponding to said second data write request in said cache memory, transmitting a third data write request corresponding to said second data write request to said second storage control apparatus by referring to mapping information between a second LUN, designated by said second data write request, and a third LUN of a second logical volume to which said second storage control apparatus executes a data write process of said second data,wherein said first storage control apparatus transmits a second completion notice of said second data write request without waiting for a third completion notice from said second storage control apparatus, said third completion notice corresponding to the said third data write request,wherein when said first storage control apparatus receives a first data read request, said first storage control apparatus transmits a second data read request corresponding to said first data read request to said second storage control apparatus by referring to said mapping information.

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