Solid-State Storage Array Reconfiguration After Element Failure
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Solution Overview
Problem
Solid-state storage systems face challenges in maintaining data integrity and functionality when storage elements fail, leading to data loss if the number of defective devices falls below the threshold that RAID systems can accommodate, as existing solutions do not efficiently reconfigure arrays with fewer storage elements.
Innovation Solution
The system reconfigures an array of solid-state storage elements using parity data by determining unavailable storage elements, reading data from available elements, regenerating missing data, and generating new error correction codes to store data on a reduced number of storage elements, ensuring data integrity and system functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If storage elements are removed from the array to reduce cost or replace failed devices, then device complexity and cost are reduced, but data integrity and reliability deteriorate because the RAID system can no longer accommodate the required number of failed devices
Solution Approach 1:
The system dynamically changes the operational parameters of the storage array by regenerating parity data and recalculating distribution schemes when storage elements become unavailable. This allows the array to adapt its configuration from an original N+P setup to a reduced configuration while maintaining data integrity through updated error correction codes and parity distributions.
Solution Approach 2:
The patent implements a dynamic reconfiguration process where the storage array automatically adjusts its structure in response to failed or removed storage elements. The system transitions from a static RAID configuration to a dynamic one that can accommodate changes in the number of storage elements while preserving data protection capabilities through regenerated parity and ECC data.
2Loss of substance
If storage elements are removed from the array, then loss of substance (storage capacity) is reduced, but loss of information occurs because data cannot be recovered when defective devices fall below the RAID threshold
Solution Approach 1:
The system performs preliminary actions by proactively regenerating parity data and updating error correction codes before storage elements are actually removed or fail. This advance preparation ensures that when storage elements are reduced, the remaining array is already configured to maintain data recovery capability, preventing information loss that would occur if the threshold were breached.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors the number of available storage elements and automatically triggers reconfiguration processes when thresholds are approached. This feedback loop ensures that data recovery capability is maintained by adjusting the array configuration in response to changes in storage element availability, preventing the system from entering a state where data loss would occur.
3Ease of operation
If traditional RAID systems are used with fixed configuration, then ease of operation is maintained, but adaptability deteriorates because the system cannot efficiently reconfigure when storage elements become unavailable
Solution Approach 1:
The system performs self-service by automatically detecting when storage elements become unavailable and initiating the reconfiguration process without external intervention. The storage array autonomously regenerates parity data, recalculates error correction codes, and redistributes data across remaining elements, maintaining ease of operation while dramatically improving adaptability to changing storage conditions.
Data Source
AI summary
An apparatus, system, and method are disclosed for reconfiguring an array of solid-state storage elements protected using parity data. The storage element error module determines that one or more storage elements are unavailable to store data (“unavailable storage elements”). The storage element resides in an array with N number of storage elements storing a first ECC chunk and P number of storage elements storing first parity data. The reconfigure data read module reads data from storage elements other than the unavailable storage elements. The data regeneration module uses the first parity data to regenerate missing data from the first ECC chunk. The data reconfiguration module creates a second ECC chunk. The new configuration storage module stores a portion of the second ECC chunk and associated second parity data on (N+P)−Z number of storage elements, wherein 1≦Z≦P.