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STORAGE SYSTEM

  • US 20110264854A1
  • Filed: 03/24/2009
  • Published: 10/27/2011
  • Est. Priority Date: 03/24/2009
  • Status: Active Grant
First Claim
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1. A storage system, comprising:

  • a plurality of storages for storing data; and

    a controller connected to a host computer via a network and which identifies access from the host computer, specifies a storage to be subject to the access among the plurality of storages, sends and receives data to and from the specified storage, and controls an operation mode of the plurality of storages;

    wherein the controller controls the operation mode of either an idle operation mode which causes the storage to enter an idle status, or a plurality of power saving operation modes which cause the storages to enter a power saving status that saves more power than the idle operation mode;

    wherein the controller includes a local memory for storing the respective upper limit values of a plurality of control cycle counts showing an execution count of a plurality of control cycles in which the idle operation mode and each of the power saving operation modes make a circuit; and

    wherein, during the course of controlling the operation mode, the controller measures each of the control cycle counts, and selects a power saving operation mode among the plurality of power saving operation modes based on the measured value for deconcentrating the increase in the measured value of each of the control cycle counts in relation to each of the upper limit values.

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