Pure Storage, Inc.

International Business Machines Corporation

Robert Clark McCammon

Jason K Resch

Thomas Franklin Shirley, Jr

Russell Paul Kennedy

Greg R Dhuse

Andrew D Baptist

S Christopher Gladwin

Niall John McShane

Gregory Palinckx

James Sherer

A processing system of a storage network operates by receiving a write request associated with a data object; identifying dispersed storage error encoding parameters; and determining a number of available storage units. When the number of available storage units is determined to exceed a first number, the processing system operates by: determining a first write threshold number in accordance with the dispersed storage error encoding parameters; dispersed error encoding the data object to produce a first write threshold number of encoded data slices; and writing, to available storage units, the first write threshold number of encoded data slices. When the number of available storage units is determined to not exceed the first number, the processing system operates by: determining a second write threshold number in accordance with the dispersed storage error encoding parameters associated, wherein the second write threshold number is less than the first write threshold number; dispersed error encoding the data object to produce a second write threshold number of encoded data slices; and writing, to the available storage units, the second write threshold number of encoded data slices.

Facilitating write requests in a storage network

A method for execution by one or more processing modules of one or more computing devices of a storage network, the method comprises receiving a data object for processing, determining whether the data object is to be transferred to one or more remote storage location, determining whether one or more legal restrictions are associated with the data object. Based on a determination that one or more legal restrictions are associated with the data object, the method continues by determining whether the one or more legal restrictions allow transfer of the data object to a storage unit of the one or more remote storage locations. The method continues by segmenting the data object into a plurality of data segments, dispersed error encoding a data segment of the plurality of data segments in accordance with dispersed error encoding parameters to produce a set of encoded data slice and transmitting a write requests for an encoded data slice of the set of encoded data slices to the storage location for processing.

Method for determining the legal basis for transfer of a data object

A method for determining a storage location includes one or more processing modules of one or more computing devices of a storage network (SN) receiving a data object to store in a storage network (SN) and determining whether the data object is subject to a legal restriction, where a data object is subject to a legal restriction based on the data object requiring storage in a jurisdiction that subjects the data object to a retention policy. The method continues by determining one or more attributes of a first storage location of a plurality of storage locations and based on a determination that the data object is subject to a legal restriction and at least one attribute of the one or more attributes of the first storage location, transmitting a write threshold number of write requests to a plurality of SUs at the first storage location.

Determining a storage location according to data retention policies

Systems and method for determining a storage location according to legal requirements. According to one example a dispersed storage (DS) processing unit receives data to store in a dispersed storage network (DSN) and assesses attributes of data to produce a determination of whether the data falls into one or more defined legal categories. The DS processing unit also determines one or more attributes of a storage location in the DSN. The DS processing unit then determines whether or not to select the storage location based on the determination and based on one or more attributes of the storage location. If storing data of the identified category would be illegal the DS processing unit evaluates the another storage location, and so on. If no available storage location is found the DS processing unit returns an error indicating that no legal storage location is found.

Determining a storage location according to legal requirements

A method for execution by a dispersed storage and task (DST) processing unit that includes a processor includes determining to access a set of storage units; identifying an information dispersal algorithm (IDA) width and a decode threshold number associated with the set of storage units; determining a number of available storage units of the set of storage units; determining a write threshold number and a read threshold number based on the number of available storage units and in accordance with a consistency approach; and accessing at least some of the available storage units utilizing at least one of the write and read threshold numbers.

Facilitating data consistency in a dispersed storage network

A method begins by a requesting entity sending a normal data segment access request to first and second groups of storage units of a dispersed storage network. The method continues with the requesting entity sending a group failure data segment access request to the first group of storage units when the second group of storage units has less than a decode threshold number of encoded data slices of a set of encoded data slices available. When the second group of storage units has reestablished that the at least the decode threshold number of encoded data slices is available, the method continues with the requesting entity sending a re-integration data segment write request to the first and second groups of storage units and sending a re-integration data segment read request to the first group of storage units.

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Downer Grove, IL, United States of America

Robert Clark McCammon