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Shifting wearout of storage disks

  • US 10,664,176 B2
  • Filed: 04/16/2018
  • Issued: 05/26/2020
  • Est. Priority Date: 10/22/2015
  • Status: Active Grant
First Claim
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1. A method for shifting wearout of storage disks in an array of storage disks in a storage system, the method comprising:

  • determining, by a controller of the storage system, a first replacement duration for the array, the first replacement duration is determined based on a mean time to failure of the storage disks in the array, the replacement duration being a sum of the mean time to failure and a predetermined deviation of the mean time to failure;

    replacing, by the controller, for the first replacement duration, a first pair of storage disks with a pair of replacement disks, the first pair of storage disks comprising a first storage disk and a second storage disk, and the pair of replacement disks comprising a first replacement disk and a second replacement disk, the first storage disk replaced by the first replacement disk and the second storage disk replaced by the second replacement disk, and wherein replacing a storage disk by a replacement disk comprises;

    copying, by the controller data from the storage disk in the array to the replacement disk; and

    redirecting, by the controller, a request to access the data from the storage disk to the replacement disk;

    determining, by the controller, a second replacement duration for the array, the second replacement duration is a multiple of the first replacement duration; and

    replacing, by the controller, a second pair of storage disks with the pair of replacement disks for the second replacement duration.

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