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Storage system having a thin provisioning function

  • US 9,256,524 B2
  • Filed: 12/21/2012
  • Issued: 02/09/2016
  • Est. Priority Date: 08/17/2001
  • Status: Active Grant
First Claim
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1. A storage system coupled to an external storage system, the external storage system including a plurality of external storage devices on which one or more external logical volumes is created, the storage system comprising:

  • a plurality of internal storage devices; and

    a controller being configured to manage a plurality of virtual volumes, and manage one or more first logical devices, in the storage system, corresponding to the plurality of internal storage devices and one or more second logical devices, in the storage system, corresponding to the one or more external logical volumes,the controller further being configured to;

    manage a plurality of first storage segments in the first logical devices as unallocated storage segments to at least a first virtual volume of the plurality of virtual volumes and manage a plurality of second storage segments in the second logical devices as unallocated storage segments to at least a second virtual volume of the plurality of virtual volumes, where each of the plurality of first storage segments and each of the plurality of second storage segments has the same size,allocate, after receiving a first write request to the first virtual volume of the plurality of virtual volumes, a first storage segment of the plurality of first storage segments in the first logical devices to the first virtual volume, and store data corresponding to the first write request to the allocated first storage segment, andallocate, after receiving a second write request to the second virtual volume of the plurality of virtual volumes, a second storage segment of the plurality of second storage segments in the second logical devices to the second virtual volume, and send data corresponding to the second write request to the external storage system.

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