Proxying Slice Access During Encoded Data Evacuation
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Solution Overview
Problem
Existing distributed storage networks face challenges in maintaining data integrity and availability during storage unit failures and data evacuation processes, leading to inefficiencies and resource wastage due to incomplete data transfer and rebuilding processes.
Innovation Solution
Implementing a dispersed storage network with error encoding and decoding capabilities using Cauchy Reed-Solomon encoding, along with a proxying mechanism for slice access requests during data evacuation, to ensure data redundancy and efficient transfer of encoded data slices between storage units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data is stored in a distributed storage network without error encoding, then storage simplicity is improved, but data integrity and reliability deteriorate during storage unit failures
Solution Approach 1:
The patent segments data into multiple encoded slices using Cauchy Reed-Solomon encoding, distributing them across different storage units. This allows the system to tolerate failures of individual storage units while maintaining data integrity, as the encoding ensures that sufficient slices can be recovered even when some storage units fail.
Solution Approach 2:
The patent changes the data representation by applying error encoding transformations, converting original data into encoded slices with specific redundancy properties. This parameter change enables the system to trade storage complexity for improved reliability, as the encoded form provides mathematical guarantees for data recovery.
2Speed
If data evacuation is performed without proxying mechanism, then data transfer speed is improved, but data availability deteriorates during evacuation process
Solution Approach 1:
The patent introduces a proxying mechanism that acts as an intermediary during data evacuation. When a storage unit is being evacuated, the proxy redirects read requests to alternative storage units that already contain the encoded slices. This maintains data availability during evacuation without slowing down the evacuation process itself.
Solution Approach 2:
The system performs preliminary encoding of data into multiple slices and distributes them across storage units before evacuation is needed. This preliminary action ensures that during evacuation, data can be served from other units that already have the encoded slices, maintaining availability while enabling fast evacuation.
3Reliability
If complete data transfer is performed during evacuation, then data redundancy is improved, but resource usage deteriorates due to unnecessary transfers
Solution Approach 1:
The patent applies partial action by transferring only the necessary encoded slices during evacuation, not complete data sets. The error encoding scheme is designed so that a subset of slices suffices for data recovery, allowing the system to evacuate only essential portions and avoid unnecessary resource consumption while maintaining adequate redundancy.
Data Source
AI summary
A method begins by a processing module receiving a checked write slice request from a requesting entity. The method continues by determining that locally stored encoded data slices do not include the requested encoded data slice. The method continues by identifying an alternate location for the requested encoded data slice. The method continues by determining whether the alternate location is associated with storage of the encoded data slice. The method continues when the alternate location is associated with the storage of the encoded data slice, by issuing a favorable checked write slice response to a requesting entity. The method can include facilitating transfer of the requested encoded data slice from the alternate location to the storage unit for storage.