Abstract:
A method begins generating a plurality of list digest request frames. Each list digest request frames includes a payload section and a protocol header. The payload section includes a start slice name field, an end slice name, and a response count field. The protocol header includes a payload length field and an operation code field to indicate the list digest request operation. The method continues by outputting the list digest request frames to storage units of a dispersed storage network.
Abstract:
A dispersed storage system includes a plurality of storage units that each include a partial rebuild grid module. The partial rebuild grid module includes partial rebuilding functionality to reconstruct one of a plurality of encoded data slices wherein the plurality of encoded data slices are generated from a data segment based on an error encoding dispersal function. In the partial rebuilding process, a data slice is rebuilt by combining in any order slice partials generated from at least a threshold number T of the plurality of data slices.
Abstract:
A method begins by a processing module generating a payload section of a dispersed storage network (DSN) frame regarding a check request operation by generating one or more slice name fields of the payload section to include one or more slice names corresponding to one or more encoded data slices and generating a transaction number field of the payload section to include a transaction number corresponding to the check request operation. The method continues with the processing module generating a protocol header of the DSN frame by generating a payload length field of the protocol header to include a payload length that represents a length of the payload section and generating remaining fields of the protocol header.
Abstract:
A method begins by a processing module generating a payload of a dispersed storage network frame regarding a conclusive write request operation by generating one or more slice name fields of a payload to include one or more slice names corresponding to one or more write commit responses of a write request operation, wherein the conclusive write request operation is a conclusive phase of the write request operation. The method continues with the processing module generating one or more slice revision numbering fields of the payload, wherein each slice revision numbering field includes a slice revision number corresponding to an associated slice name of the one or more slice names. The method continues with the processing module generating a protocol header of the DSN frame by generating a payload length field of the protocol header to include a payload length and generating remaining fields of the protocol header.
Abstract:
A data object interface to a dispersed data storage network is disclosed. The disclosed interface accepts read and write commands from a client computer and generates network commands that are forwarded to slice servers that form the storage component of the dispersed data storage network. The slice servers then fulfill the read and write commands.
Abstract:
A method begins by a processing module identifying a set of encoded data slices that have been created in accordance with a dispersed storage error encoding function having a decode threshold equal to or less than half of a number encoded data slices in the set of encoded data slices. The method continues with the processing module identifying a first sub-set of encoded data slices having a non-current revision level and identifying a second sub-set of encoded data slices having a more-current revision level. When a number of encoded data slices of the second sub-set of encoded data slices is greater than or equal to the decode threshold and when a number of encoded data slices of the first sub-set of encoded data slices is less than the decode threshold, the method continues with the processing module facilitating rebuilding of the first sub-set of encoded data slices.
Abstract:
A method begins by determining that a disk drive of a slice server has been replaced with a new disk drive. The method continues by identifying a data slice that was stored on the disk drive and identifying a data segment based on the identified data slice. The method continues by identifying other slice servers that are storing other data slices of the encoded data segment. The method continues by retrieving, from the other slice servers, a sufficient number of the other data slices to reconstruct the data segment and decoding the sufficient number of the other data slices to reconstruct the data segment. The method continues by encoding the reconstructed data segment in accordance with the information dispersal algorithm to produce a new set of data slices. The method continues by selecting a data slice of the new set of data slices as a rebuilt data slice.
Abstract:
A storage integrity system in a dispersed storage network scans an address range of data slices to identify errors in one of a plurality of encoded data slices, wherein the plurality of encoded data slices are generated from a data segment using an error encoding dispersal function. When the storage integrity system detects an error, it identifies one of the encoded data slices for rebuilding. The identified data slice is rebuilt in response to the type of error. For example, when the type of the error includes a temporary error, the storage integrity system waits a predetermined time period to determine whether the error still exists prior to rebuilding the identified data slice.