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Providing storage control in a network of storage controllers

  • US 7,865,486 B2
  • Filed: 04/16/2008
  • Issued: 01/04/2011
  • Est. Priority Date: 11/28/2002
  • Status: Expired due to Fees
First Claim
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1. A computer program product residing on a computer recordable medium for providing control on metadata within a network of storage controllers, wherein said computer program product comprising:

  • program code means for 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;

    program code means for designating remaining of said storage controllers as client storage controllers;

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

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

    program code means for, 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,program code means for placing a lock record against said metadata associated with said region of storage;

    program code means for copying data within said region of storage by said owner storage controller; and

    program code means for releasing said lock record to process said I/O request.

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