Cleversafe, Inc.

International Business Machines Corporation

Dusty Hendrickson

Jason K Resch

Greg R Dhuse

Ilya Volvovski

Vance T Thornton

John Quigley

Bart Richard Cilfone

Zachary J Mark

Sanjaya Kumar

Steve Hoffman

Lynn Foster

Jerri Lynn Foster

Ilya Volvoski

John Guigley

Zackary Mark

An improved system is disclosed for ensuring the integrity of data stored on a dispersed data storage network. Checksums are used to ensure integrity of both data segments and data slices. Checksums appended to data slices are checked by receiving slice servers to ensure that no errors occurred during transmission. Slice servers also periodically recalculate checksums for stored data slices to ensure that data slices have not been corrupted during storage. Checksums appended to data segments are checked when data segments are read from the storage network.

Ensuring data integrity on a dispersed storage grid

A method of upgrading software components within a dispersed data storage network is disclosed. A list of identifiers corresponding to devices within the dispersed data storage network is assembled. Each member of the list is assigned to an upgrade set based on the devices that are reachable by the vaults associated with the device.

Systems, apparatus, and methods for utilizing a reachability set to manage a network upgrade

A rebuilder application operates on a dispersed data storage grid and rebuilds stored data segments that have been compromised in some manner. The rebuilder application actively scans for compromised data segments, and is also notified during partially failed writes to the dispersed data storage network, and during reads from the dispersed data storage network when a data slice is detected that is compromised. Records are created for compromised data segments, and put into a rebuild list, which the rebuilder application processes.

Rebuilding data on a dispersed storage network

Growing community of inventors

Chicago, IL, United States of America

Dusty Hendrickson