DSN Data Segment Pre-Fetch Buffering for Reliable Retrieval
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Solution Overview
Problem
Current data storage systems face challenges with data integrity and security due to the failure of physical movement-based memory devices, such as disc drives, which can lead to bit-level corruption and complete failure within three years, and redundant array of independent discs (RAID) solutions increase maintenance demands and security risks with multiple copies of data.
Innovation Solution
A distributed storage network with error-coded data slices is implemented, where data is partitioned into segments, encoded, and stored across multiple physically diverse locations, allowing for reliable and secure data retrieval even in the event of device failures, using techniques like Reed-Solomon encoding and Shamir secret sharing for redundancy and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is stored using conventional memory devices or RAID solutions, then data storage capacity is achieved, but data integrity and security deteriorate due to device failures and unauthorized access risks
Solution Approach 1:
The patent divides data into multiple data segments and further partitions each segment into multiple slices, which are then distributed across different storage devices. This segmentation approach ensures that no single device holds complete data, protecting against unauthorized access and failures while maintaining data integrity through distributed storage.
Solution Approach 2:
The system performs pre-fetching of data segments by monitoring access patterns and proactively retrieving data segments before they are actually requested. This preliminary action reduces latency and improves data availability while maintaining system reliability through anticipatory data loading.
2Reliability
If redundant array of independent discs (RAID) is used to protect against disc failure, then data security improves, but storage capacity is reduced due to parity overhead
Solution Approach 1:
Instead of using traditional RAID parity blocks that reduce overall storage capacity, the patent segments data into multiple independent slices distributed across devices. This allows full utilization of storage capacity on each device while providing redundancy through distribution, eliminating the capacity penalty associated with RAID parity overhead.
3Productivity
If data is pre-fetched to improve access speed, then productivity increases, but data consumption rate may exceed DS unit response rate causing buffer overflow
Solution Approach 1:
The pre-fetch buffer management system dynamically adjusts buffer allocation and pre-fetching rates based on real-time monitoring of data consumption patterns and DS unit response rates. This dynamic adaptation ensures optimal data access speed while preventing buffer overflow by adjusting pre-fetch intensity to match actual system capacity and demand.
Solution Approach 2:
The system implements feedback mechanisms that monitor data consumption rates and DS unit response rates, using this information to adjust pre-fetching behavior. When buffers approach capacity or response rates decrease, the system reduces pre-fetching intensity, preventing overflow while maintaining efficient data access when conditions permit.
Data Source
AI summary
A method begins by a processing module receiving a data segment retrieval request regarding a data segment, which is stored in a dispersed storage network (DSN) memory. The method continues with the processing module processing the data segment retrieval request, determining pre-fetch segment buffering information, and when the pre-fetch segment buffering information indicates pre-fetching one or more other data segments, generating one or more pre-fetch segment retrieval requests for the one or more other data segments, receiving, one or more sets of at least a decode threshold number of encoded data slices, decoding, in accordance with a dispersed storage error coding function, the one or more sets of at least a decode threshold number of encoded data slices to reproduce the one or more other data segments, and updating a pre-fetch segment buffer with the one or more other data segments.