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Managing data placement based on flash drive wear level

  • US 9,811,288 B1
  • Filed: 12/30/2011
  • Issued: 11/07/2017
  • Est. Priority Date: 12/30/2011
  • Status: Active Grant
First Claim
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1. A method for use in managing data in a data storage system, the method comprising:

  • identifying a tiered storage pool wherein the storage pool includes multiple tiers, each tier having multiple storage units;

    monitoring a wear indicator and a wear rate for each of the multiple storage units wherein the wear indicator is based on a lifetime erasure count associated with the multiple storage units and the wear rate is associated with the rate at which the wear indicator increases;

    determining, for each of the multiple storage units, a predetermined warranty end period and a projected end of life value, wherein the end of life value is based on the wear indicator, the wear rate and the lifetime erasure count,identifying a first storage unit wherein the projected end of life value will occur before the corresponding warranty end period and a second storage unit wherein the projected end of life value will not occur before its corresponding warranty end period;

    identifying high activity data on the first storage unit wherein activity corresponds to an erasure count associated with the data; and

    migrating the identified high activity data from the first storage unit to the second storage unit.

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