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Disk subsystems and their integrated system

  • US 20040103164A1
  • Filed: 10/20/2003
  • Published: 05/27/2004
  • Est. Priority Date: 04/26/1999
  • Status: Active Grant
First Claim
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1. A plurality of storage systems comprising:

  • a first storage system including a first controller controlling a first write request received, and a first storage storing data under control by said first controller;

    a second storage system including a second controller controlling a second write request received, and a second storage storing data under control by said second controller;

    a third storage system connected to said first storage system and said second storage system, said third storage system comprises;

    a third controller controlling data received from said first storage system synchronously and controlling data received from said second storage system synchronously, and a third storage storing data under control by said third controller; and

    a fourth storage system connected to said third storage system, said fourth storage system comprises;

    a fourth controller controlling data received from said third storage system asynchronously, and a fourth storage storing data under control by said fourth controller.

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