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Method and apparatus for providing storage control in a network of storage controllers

  • US 7,401,081 B2
  • Filed: 05/29/2003
  • Issued: 07/15/2008
  • Est. Priority Date: 11/28/2002
  • Status: Active Grant
First Claim
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1. A method for providing control on metadata within a network of storage controllers, said method comprising:

  • designating one of said storage controllers as an owner storage controller, wherein said owner storage controller owns metadata controlling all input/output (I/O) operations associated with a region of storage;

    designating remaining of said storage controllers as client storage controllers;

    in response to an I/O request to one of said client storage controllers, suspending said I/O request by said one client storage controller;

    determining by said owner storage controller, whether or not said region of storage has already been copied;

    in a determination that said region of storage has been copied, unpending said I/O request by said one client storage controller to process said I/O request; and

    in a determination that said region of storage has not been copied,placing a lock record against said metadata associated with said region of storage;

    copying data within said region of storage by said owner storage controller; and

    releasing said lock record to process said I/O request.

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