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STORING RAID DATA AS ENCODED DATA SLICES IN A DISPERSED STORAGE NETWORK

  • US 20140351631A1
  • Filed: 08/13/2014
  • Published: 11/27/2014
  • Est. Priority Date: 02/27/2010
  • Status: Active Grant
First Claim
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1. A method for execution by a processing module in a distributed storage (DS) unit, the method comprising:

  • receiving a request to retrieve data;

    identifying a set of redundant array of independent disks (RAID) data blocks and corresponding RAID parity blocks that correspond to the data within RAID memory;

    when the set of RAID data blocks is error-free;

    retrieving the data based on the set of RAID data blocks; and

    outputting, via a communication interface of the DS unit, the data based on the set of RAID data blocks; and

    when the set of RAID data blocks includes more errors than are correctable based on the RAID parity blocks;

    retrieving the data based on a backup copy of the data from a dispersed storage network (DSN) memory, wherein the backup copy of the data is stored in the DSN memory as one or more sets of encoded data slices; and

    outputting, via the communication interface of the DS unit, the data based on the backup copy of the data.

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