International Business Machines Corporation

Venkata Giri Badanahatti

Harsha Hegde

A method for execution by a dispersed storage and task (DST) processing unit includes determining to determine to overwrite an original data object stored in a plurality of storage units with an updated data object. Validation level data can be determined, where the validation level data indicates a data object overwrite level, a data region overwrite level, or a data segment overwrite level. Checksum metadata associated with the original data object can be retrieved in response to determining to overwrite an original data object. Overwriting of a subset of data regions or data segments of the original data object can be foregone in response to generating validation data that indicates their checksums in the checksum metadata compare favorably to corresponding overwrite checksum values.

Overwriting data objects in a dispersed storage network

A method for responding to a read request from a user for a set of encoded data slices (EDSs) in a distributed storage network begins with a processing module determining that a threshold number of encoded data slices is not available and continues with the processing module determining that one or more copies are available for the set of EDSs. The method continues with the processing module determining whether a combination of the one or more additional EDSs within the copy of the set of EDSs and the available EDSs from the set of EDSs is at least a read threshold number of EDSs, and when a read threshold is available based on the combination the processing module responds to the request using the combination.

Using data object copies to improve the performance of a distributed storage network

Methods for use in a dispersed storage network (DSN) to determine appropriate resources for storing data. In various examples, a network control unit obtains status information relating to the DSN. The status information, which may be updated periodically, may include information relating to storage unit utilization, network loading and performance levels, data size indicators, access profiles specifying differentiated service levels, etc. Based on the status information, the network control unit maps each of a plurality of data classes to a plurality of sets of storage units, and generates network control information based on the mapping. The network control information, which may include routing instructions and storage set utilization information, is issued to a network routing unit for use in facilitating storage (e.g., via IP address translation) of differing classes of data in the sets of storage units in accordance with the mapping.

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Bloomingdale, IL, United States of America

Venkata Giri Badanahatti