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Updating a set of memory devices in a dispersed storage network

  • US 9,122,596 B2
  • Filed: 04/21/2014
  • Issued: 09/01/2015
  • Est. Priority Date: 11/01/2010
  • Status: Active Grant
First Claim
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1. A method for execution by a storage unit of a distributed storage network (DSN), the method comprises:

  • tracking age related failure levels of a plurality of memory devices within the storage unit in a memory assignment table;

    maintaining a data location table that maps a range of DSN addresses allocated to the storage unit to the plurality of memory devices and further records storing of encoded data slices having specific DSN addresses within corresponding ones of the plurality of memory devices;

    when the age related failure level for a memory device of the plurality of memory devices compares unfavorably to a first failure level threshold;

    determining to reassign a portion of DSN addresses assigned to the memory device;

    identifying a second memory device of the plurality of memory devices having a corresponding age related soft failure level comparing favorable to the first failure level threshold;

    reassigning the portion of the DSN addresses from the memory device to the second memory device; and

    updating the data location table in accordance with the reassigning the portion of the DSN addresses.

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