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Scheduling of reconstructive I/O read operations in a storage environment

  • US 9,436,396 B2
  • Filed: 10/13/2014
  • Issued: 09/06/2016
  • Est. Priority Date: 09/15/2010
  • Status: Active Grant
First Claim
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1. A computer system comprising:

  • a data storage medium comprising a plurality of storage devices configured to store data in at least one redundant array of independent disks (RAID) group; and

    a data storage controller coupled to the data storage medium;

    wherein the data storage controller is configured to;

    receive a read request targeted to the data storage medium;

    identify at least a first storage device of the plurality of storage devices which currently contains data targeted by the read request; and

    make a determination, based on whether the first storage device has exceeded a first time period for responding to the read request without exceeding a second time period for responding to the read request, to generate a reconstruct read request configured to obtain the data from one or more devices of the plurality of storage devices other than the first storage device.

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