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Selecting a virtual tape server in a storage system to provide data copy while minimizing system job load

  • US 9,886,211 B2
  • Filed: 07/01/2010
  • Issued: 02/06/2018
  • Est. Priority Date: 10/07/2009
  • Status: Active Grant
First Claim
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1. A virtual tape server storage system comprising:

  • a plurality of storage devices communicatively connected with each other;

    a plurality of source storage devices including at least a first source storage device and a second source storage device each processing data volumes in response to copy request jobs from other storage devices, and holding a job list of the data volumes being processed and attribute information thereof; and

    a target storage device requesting a copy of data from one of the plurality of source storage devices, wherein said one of the plurality source storage devices is selected before commencement of processing the data volumes based on the attribute information so as to minimize system job load;

    wherein the selection of said one of the first and second source storage devices comprises;

    (a) calculating first and second load values representing job loads processed, respectively, by the first and second source storage devices;

    (b) adding a job load value for said data respectively to the first and second load values to obtain a first final load value for the first source storage device and a second final load value for the second source storage device, respectively;

    (c) adding the second load value to the first final load value to obtain a first total system load value for the storage system;

    (d) adding the first load value to the second final load value to obtain a second total system load value for the storage system;

    (e) comparing the first total system load value with the second total system load value;

    (f) selecting said one of the first and second source storage devices based on the comparison to minimize the system job load; and

    (g) requesting the copy of data from said one of the first and second source storage devices.

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