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Storage system and data control method

  • US 10,452,302 B2
  • Filed: 04/09/2015
  • Issued: 10/22/2019
  • Est. Priority Date: 04/09/2015
  • Status: Active Grant
First Claim
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1. A storage system comprising:

  • a first storage device;

    a second storage device with a smaller upper limit number of writes and a larger storage capacity per unit area than those of the first storage device; and

    a processor that allocates storage areas from the first storage device and the second storage device to a virtual volume to be provided to a host,wherein the processor;

    relocates data which is stored in a storage area with higher write frequency from the host than a predetermined write threshold, from among the storage areas allocated from the second storage device to the virtual volume, from the storage area of the second storage device to a storage area of the first storage device; and

    predicts, for a storage area to be newly allocated to the host, a write frequency to the storage area to be newly allocated on the basis of write frequency to storage areas already allocated to the host, determines to which of the first storage device and the second storage device the storage area should be allocated based on the predicted write frequency, and allocates the storage area.

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