REBUILDING AND VERIFYING AN ENCODED DATA SLICE UTILIZING SLICE VERIFICATION INFORMATION
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United States of America Patent
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Jan 20, 2017
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May 29, 2015
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Abstract
Methods for rebuilding data in a dispersed storage network (DSN) in a verified manner. In various examples, an integrity processing unit determines to rebuild an encoded data slice of a set of stored data slices. A decode threshold number of data slices and integrity slices are retrieved. The integrity slices are decoded to produce a set of integrity values corresponding to the data slices. An integrity value of the set of integrity values is calculated. The decoded integrity values are validated when the calculated value matches a retrieved value stored in conjunction with the data slices. The received data slices are decoded to produce data that is re-encoded to produce a set of re-encoded data slices. A set of integrity values is calculated for the re-encoded data slices. The re-encoded data slices, including the rebuilt data slice, are validated when the calculated integrity values match the validated decoded integrity values.
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