Deferred Slice Rebuilding Across Alternate Storage Locations

The patent segments data into multiple encoded slices using Cauchy Reed-Solomon error encoding. Instead of storing complete redundant copies of data, the system divides data into fragments and distributes them across multiple storage units. This segmentation allows the system to tolerate failures of up to k-1 storage units while maintaining data availability, reducing the overhead compared to traditional redundant copying methods.

The patent changes the storage parameter from storing complete data copies to storing encoded data slices. By applying Cauchy Reed-Solomon encoding with configurable parameters (total slices n, failure tolerance k), the system dynamically adjusts the balance between storage efficiency and reliability. This parameter-based approach allows flexible optimization based on specific reliability requirements without proportionally increasing complexity.

The patent applies error correction encoding to data before storage, creating encoded slices that inherently contain error correction capabilities. This preliminary action ensures that data integrity is maintained without requiring complex real-time error correction during retrieval. The Cauchy Reed-Solomon encoding is performed once during data ingestion, and the encoded slices are then stored as-is, simplifying the overall error correction mechanism.

The patent creates multiple copies of encoded data slices and distributes them across different storage units. Instead of copying complete data and then applying error correction, the system encodes data into slices first, then creates and distributes copies of these encoded slices. This approach reduces the computational overhead of error correction while maintaining data integrity, as the encoding is performed once on the original data.

The patent segments data into n encoded slices that are distributed across multiple storage units. During retrieval, the system only needs to gather k slices (where k < n) to reconstruct the original data, rather than retrieving all n slices or waiting for all storage units. This segmentation strategy reduces retrieval time while maintaining the ability to tolerate up to n-k failures, effectively balancing availability with time efficiency.

The patent implements partial action by requiring only k slices out of n total slices for data reconstruction. This means the system performs less work during retrieval than traditional methods would require, as it doesn't need to gather all distributed copies or perform exhaustive searches. The partial retrieval of k slices is sufficient to restore data availability, reducing the time loss associated with distributed storage operations.