Hybrid RAID-DSN Storage for Data Reliability

The patent segments data into multiple data slices and applies different encoding strategies to different segments. Specifically, it divides data into hot data (frequently accessed) and cold data (infrequently accessed), then applies distinct encoding schemes: Cauchy Reed-Solomon encoding for hot data and simpler parity encoding for cold data. This segmentation allows the system to achieve high security for critical data while maintaining efficiency for less critical data, resolving the contradiction between security and complexity.

The patent changes the encoding parameters based on data characteristics and access patterns. For hot data requiring high security, it uses Cauchy Reed-Solomon encoding with specific threshold parameters (k data slices needed to reconstruct). For cold data, it uses simpler encoding with different parameters. This dynamic parameter adjustment allows the system to optimize both security and computational complexity based on actual needs.

The patent applies the principle of local quality by using different encoding schemes for different data portions based on their access patterns and security requirements. Hot data (frequently accessed) receives Cauchy Reed-Solomon encoding for high security, while cold data (infrequently accessed) uses simpler encoding. This localized application of quality measures ensures high productivity for cold data while maintaining high reliability for hot data, resolving the contradiction between security and efficiency.

The patent applies partial action by not using the most robust encoding (Cauchy Reed-Solomon) for all data, but only for the portion that requires it (hot data). For cold data, it uses minimal sufficient encoding. This partial application of excessive security measures where needed and reduced measures where sufficient resolves the contradiction between achieving high reliability and maintaining productivity.

The patent segments data into slices and distributes them across multiple storage units with error encoding, rather than creating full redundant copies. The segmentation allows the system to achieve data availability through distributed storage with fewer total copies, as error encoding enables reconstruction from a threshold number of slices rather than requiring complete copies.

The patent changes the redundancy parameter from traditional RAID approaches (fixed redundancy levels) to threshold-based redundancy where only k out of n slices are needed to reconstruct data. This parameter change allows more efficient use of storage space while maintaining data availability, as the system can tolerate more failures with the same storage capacity.