Flash Memory Controller Parity Group Failure Recovery
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Solution Overview
Problem
Flash memory storage systems face reliability issues due to signal component failures, which can lead to data volatility and reduced system reliability despite increased capacity, as existing measures only address write failure and not signal component failures.
Innovation Solution
A flash memory storage system with a controller that manages a plurality of flash memory devices, utilizing parity groups and configuration control units to detect and recover from component failures, ensuring data integrity and system reliability by redistributing data across compatible flash memory devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If flash memory devices are used to increase storage capacity, then storage capacity is improved, but reliability deteriorates due to signal component failures causing data volatility
Solution Approach 1:
The storage system is segmented into multiple parity groups, each containing multiple flash memory devices. This segmentation allows the system to isolate failures to specific groups while maintaining operational integrity of other groups, thereby preserving overall system reliability as capacity scales.
Solution Approach 2:
The system performs preliminary detection of component failures through configuration control units that monitor flash memory device status. When failures are detected, the system proactively redistributes data before data loss occurs, preventing volatility and maintaining reliability.
2Reliability
If multiple flash memory devices are configured in parity groups, then reliability is improved through failure detection and recovery, but device complexity increases
Solution Approach 1:
The configuration control unit serves multiple functions: it detects component failures, determines parity group status, and executes data redistribution. This multi-functionality consolidates control logic into a single unit, managing reliability improvements without proportionally increasing overall system complexity.
Solution Approach 2:
The system performs automatic self-diagnosis and self-repair through the configuration control unit, which autonomously detects failures and redistributes data without external intervention. This self-service capability maintains high system availability while minimizing the complexity of external control mechanisms.
Data Source
AI summary
A flash memory storage system has a plurality of flash memory devices comprising a plurality of flash memories, and a controller having an I/O processing control unit for accessing a flash memory device specified by a designated access destination in an I/O request received from an external device from among the plurality of flash memory devices. A parity group can be configured of flash memory devices having identical internal configuration.