Dispersed Storage Network Data Slice Encoding and Distribution
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Solution Overview
Problem
Conventional computer storage systems face challenges with data integrity and security due to the failure of memory devices, particularly those using physical movement technologies, which can lead to bit-level corruption and require costly upgrades or redundant arrays like RAID, increasing maintenance demands and security risks.
Innovation Solution
A distributed storage system that employs error-coded data slices stored across multiple physically diverse locations, using a dispersed storage network with a processing unit to encode and decode data, ensuring data integrity and security through redundancy and error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is stored in a single memory device, then storage capacity is sufficient, but data integrity and security are compromised due to device failure and bit-level corruption
Solution Approach 1:
The patent divides data into multiple slices and distributes them across different memory devices. Each slice is stored separately, so that if one device fails, the data can still be reconstructed from the remaining slices. This segmentation approach directly addresses the reliability issue by preventing single-point failures while maintaining manageable system complexity through organized data distribution.
Solution Approach 2:
The patent creates multiple copies of data slices and stores them in different locations. Instead of storing complete redundant copies of entire datasets, it distributes fragmented copies across multiple devices. This approach improves reliability through redundancy while avoiding the excessive complexity of traditional RAID implementations by using a more flexible, distributed copying strategy.
2Reliability
If redundant arrays like RAID are used to protect against device failure, then data security is improved, but maintenance demands and overhead costs increase
Solution Approach 1:
The patent segments data into slices that can be independently stored and managed across multiple devices. This segmentation allows for simpler maintenance operations compared to traditional RAID, as individual slices can be accessed, replaced, or recovered without requiring complex array management. The system can maintain data security while reducing maintenance overhead by operating on smaller, independent data units.
Solution Approach 2:
The patent implements error correction coding that enables the system to automatically detect and correct errors without manual intervention. The distributed storage architecture allows the system to self-manage data recovery by reconstructing lost or corrupted slices from remaining copies, reducing the need for manual maintenance and monitoring while maintaining high data security.
3Reliability
If multiple copies of data are created for redundancy, then data integrity is maintained, but storage capacity is reduced and security risks increase
Solution Approach 1:
The patent segments data into multiple slices that are distributed across the storage system. This segmentation allows for more efficient use of storage capacity compared to traditional replication, as the system can store additional slices in available space without requiring complete duplicate copies. The segmented approach maintains data integrity while maximizing the utilization of total storage capacity across all devices.
Solution Approach 2:
The patent transitions from storing complete data copies in a single dimension to distributing data slices across multiple dimensions (different devices, locations, or storage tiers). This dimensional approach allows the system to maintain data integrity through distributed redundancy while efficiently utilizing storage capacity across the entire system, rather than dedicating entire devices to redundant copies.
4Reliability
If higher-grade disc drives are used to reduce failure rates, then data reliability is improved, but system cost increases significantly
Solution Approach 1:
The patent segments data across multiple standard-grade devices rather than relying on a single high-grade device. This approach allows the system to achieve comparable or superior reliability through distribution, while using more affordable standard equipment. The segmentation strategy enables the system to tolerate individual device failures without requiring expensive high-grade drives, thereby reducing overall system cost while maintaining data reliability.
Data Source
AI summary
A method begins by a dispersed storage network (DSN) access module encoding a data segment to produce slices and sending temporary write requests to DSN storage modules, wherein the temporary write requests includes slices. In response to one of the temporary write requests, the method continues with a DSN storage module temporarily storing a slice to produce a temporarily stored slice and sending an indication of temporary storage of the slice. When a write threshold number of indications of temporary storage has been received by the DSN access module, the method continues with the DSN access module sending permanent write requests to DSN storage modules. In response to one of the permanent write requests, the method continues with the DSN storage module storing the temporarily stored slice in permanent memory and sending an indication of permanent storage of the slice.