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Virtual storage system and method for allocating storage areas and releasing storage areas from allocation based on certain commands

  • US 8,131,956 B2
  • Filed: 01/28/2011
  • Issued: 03/06/2012
  • Est. Priority Date: 02/18/2004
  • Status: Active Grant
First Claim
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1. A storage system comprising:

  • a plurality of storage devices;

    a controller that manages a virtual volume including a plurality of virtual storage areas, manages a storage pool including a plurality of storage areas prepared on said storage devices, and allocates, in response to receiving a write command to write data to said virtual volume, a storage area in said storage pool to said virtual volume for writing the data;

    wherein in response to receiving a specific write command to write a specific data to at least a first virtual storage area to which a first storage area is allocated, said controller releases said first storage area from allocation to said first virtual storage area.

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