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Storage system and control method for the same

  • US 8,090,923 B2
  • Filed: 10/20/2008
  • Issued: 01/03/2012
  • Est. Priority Date: 08/29/2008
  • Status: Expired due to Fees
First Claim
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1. A storage system in which first and second storage control devices are connected to each other for communications, the system comprising:

  • a first volume that is provided virtually to the first storage control device;

    a second volume that is provided virtually to the second storage control device with correspondence in terms of a storage space with the first volume, and is accessed in response to an access request to the first volume;

    a pool section that keeps a plurality of physical storage areas for allocation to the second volume in response to a write access request to the second volume;

    a first control section that is provided to the first storage control device, issues a command to the second volume in response to the access request to the first volume, and performs data reading/writing from/to the second volume; and

    a second control section that is provided to the second storage control device, performs data input/output to/from the second volume in response to the command from the first control section, and allocates, to the second volume, in response to a write access request from the first control section, any of the plurality of physical storage areas in the pool section not yet in use, whereinwhen receiving a first predetermined command about the first volume, the first control section converts, for transmission to the second control section, the first predetermined command into a second predetermined command to relatively reduce a write access frequency to the second volume.

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