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RECONSTRUCTING AN INDIRECTION TABLE FROM LOGGED MEDIA ADDRESSES

  • US 20150178164A1
  • Filed: 12/19/2013
  • Published: 06/25/2015
  • Est. Priority Date: 12/19/2013
  • Status: Abandoned Application
First Claim
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1. An apparatus, comprising:

  • checkpoint data for an indirection table, wherein the checkpoint data is stored in a solid state media and comprises media addresses for sequential logical addresses of the indirection table;

    journal data stored in the solid state media, wherein the journal data identifies changes in the indirection table after creation of the checkpoint data;

    metadata summaries stored in the solid state media, wherein the metadata summaries contain error correction data for the checkpoint data and journal data; and

    logic circuitry configured to;

    read the checkpoint data from the solid state media;

    read the journal data from the solid state media;

    reconstruct the indirection table by overwriting at least some of the media addresses from the checkpoint data with media addresses from the journal data;

    check for errors in the checkpoint data or the journal data; and

    use the metadata summaries to recover from the errors in the checkpoint data and/or the errors in the journal data.

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