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System and method for replacing storage devices

  • US 10,007,432 B2
  • Filed: 10/13/2015
  • Issued: 06/26/2018
  • Est. Priority Date: 10/13/2015
  • Status: Active Grant
First Claim
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1. A method of operating a redundant array of independent drives (RAID) storage system having a plurality of storage devices and a spare storage device, the method comprising:

  • a storage controller tracking input/output statistics for the storage devices;

    determining that a first storage device storing data has been identified for replacement within the plurality of storage devices;

    in response to the first storage device having been identified for replacement;

    sorting a list of data address spaces for the first storage device from a lowest frequency access to a highest frequency access, based on the I/O statistics for each data address space;

    determining a least written to data address space within the first storage device based on the input/output statistics; and

    copying data from the first storage device to the spare storage device in sequential order beginning with copying first data contained in a least written to data address space having lowest frequency access to data contained in a data address space having highest frequency access.

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