Abstract: A method includes executing a set of read requests regarding a set of encoded data slices stored in storage units of a storage network, where a data segment is encoded in accordance with a dispersed storage error coding function to produce the set of encoded data slices, and where a decode threshold number of encoded data slices of the set of encoded data slices is needed to rebuild a missing or corrupt encoded data slice of the set of encoded data slices. The method further includes determining, for an encoded data slice, whether an integrity check value substantially matches a known integrity check value. When the integrity check value does not substantially match the known integrity check value, the method further rebuilding the encoded data slice based on the decode threshold number of encoded data slices and storing the rebuilt encoded data slice in the storage units.

Abstract: A method includes executing a read request regarding a set of encoded data slices stored in storage units of the DSN, where a data segment of data is encoded in accordance with a dispersed storage error coding function to produce the set of encoded data slices, and where a decode threshold number of encoded data slices of the set of encoded data slices is required to rebuild the data segment. The method further includes reconstructing the data segment from at least the decode threshold number of encoded data slices of the set of encoded data slices, where the at least the decode threshold number of encoded data slices are included in read responses from the storage units. The method further includes determining an encoded data slice not used in the reconstructing needs to be rebuilt and rebuilding the encoded data slice using the reconstructed data segment.

Abstract: A method includes executing a read request regarding a set of encoded data slices stored in storage units of the DSN, where a data segment of data is encoded in accordance with a dispersed storage error coding function to produce the set of encoded data slices, and where a decode threshold number of encoded data slices of the set of encoded data slices is required to rebuild the data segment. The method further includes reconstructing the data segment from at least the decode threshold number of encoded data slices of the set of encoded data slices, where the at least the decode threshold number of encoded data slices are included in read responses from the storage units. The method further includes determining an encoded data slice not used in the reconstructing needs to be rebuilt and rebuilding the encoded data slice using the reconstructed data segment.

Abstract: A method includes sending, in response to read operation, read requests regarding a read threshold number of encoded data slices of a set of encoded data slices to storage units, where the read threshold number is between a decode threshold number and a total number of encoded data slices of the set of encoded data slices. The method further includes sending status inquiries regarding a remaining number of encoded data slices of the set of encoded slices to other storage units, where the remaining number equals the total number minus the read threshold number. The method further includes receiving responses from the storage units regarding the read requests and the status inquires. The method further includes determining, based on the responses, that an encoded data slice of the set of encoded data slices requires rebuilding, and rebuilding the encoded data slice while processing the read operation.

Abstract: A method includes sending, in response to read operation, read requests regarding a read threshold number of encoded data slices of a set of encoded data slices to storage units, where the read threshold number is between a decode threshold number and a total number of encoded data slices of the set of encoded data slices. The method further includes sending status inquiries regarding a remaining number of encoded data slices of the set of encoded slices to other storage units, where the remaining number equals the total number minus the read threshold number. The method further includes receiving responses from the storage units regarding the read requests and the status inquires. The method further includes determining, based on the responses, that an encoded data slice of the set of encoded data slices requires rebuilding, and rebuilding the encoded data slice while processing the read operation.

Abstract: A method begins by a dispersed storage (DS) processing sending representations of a read-rebuild inquiry request to storage units and receiving a decode threshold number of encoded data slices in response. The method continues with the DS processing module receiving a remaining number of slice status responses regarding a remaining number of encoded data slices. The method continues with the DS processing module decoding the decode threshold number of encoded data slices to reproduce a data segment and interpreting the remaining number of slice status responses to determine whether one of the remaining number of encoded data slices includes an error. When determining the error, the method continues with the DS processing module generating a rebuilt encoded data slice based on the reproduced data segment to replace the one of the remaining number of encoded data slices that includes the error.

Abstract: A method begins by a dispersed storage (DS) processing sending representations of a read-rebuild inquiry request to storage units and receiving a decode threshold number of encoded data slices in response. The method continues with the DS processing module receiving a remaining number of slice status responses regarding a remaining number of encoded data slices. The method continues with the DS processing module decoding the decode threshold number of encoded data slices to reproduce a data segment and interpreting the remaining number of slice status responses to determine whether one of the remaining number of encoded data slices includes an error. When determining the error, the method continues with the DS processing module generating a rebuilt encoded data slice based on the reproduced data segment to replace the one of the remaining number of encoded data slices that includes the error.