SSD Read Error Mitigation via Preemptive Memory Retirement
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Solution Overview
Problem
Solid state drives (SSDs) are prone to read failures during operations, which can lead to data loss and inefficient data reconstruction, even with error correction codes or RAID recovery, as existing reactive approaches negatively impact data retention and storage device performance.
Innovation Solution
The approach involves proactive detection of read errors in SSDs by identifying suspect memory portions and retiring them before catastrophic failure, using a read error mitigation module to migrate data and update retirement parameters based on thresholds, thereby reducing data loss and improving drive performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive data recovery techniques (error correction codes or RAID recovery) are used in response to read failures, then data loss can be addressed, but the SSD efficiency deteriorates due to costly data reconstruction and impaired performance
Solution Approach 1:
The patent implements preliminary action by proactively detecting read errors and retiring suspect memory portions before they cause catastrophic failure. The system monitors memory portions for read errors, identifies suspect portions, and retires them preemptively, avoiding the need for reactive data reconstruction and maintaining SSD efficiency while ensuring data reliability.
2Reliability
If read error detection and memory retirement is performed proactively, then data loss is reduced, but the device complexity increases due to additional monitoring and retirement management mechanisms
Solution Approach 1:
The patent applies self-service by enabling the SSD to autonomously monitor its own memory portions for read errors, identify suspect portions, and retire them without external intervention. The built-in read error mitigation module performs self-diagnostics and self-repair by retiring failing memory portions and remapping data, reducing the need for complex external error management systems.
3Reliability
If memory portions are retired upon detecting read errors, then data loss is prevented, but the productivity decreases due to reduced available memory capacity
Solution Approach 1:
The patent implements discarding and recovering by retiring only the specific suspect memory portions that exhibit read errors while preserving the rest of the memory capacity. The system discards only the failing portions and recovers overall productivity by remapping data from retired portions to healthy memory, maintaining maximum usable storage capacity while ensuring data integrity.
Data Source
AI summary
Read error mitigation in solid-state memory devices. A solid-state drive (SSD) includes a read error mitigation module that monitors one or more memory regions. In response to detecting uncorrectable read errors, memory regions of the memory device may be identified and preemptively retired. Example approaches include identifying a memory region as being suspect such that upon repeated read failures within the memory region, the memory region is retired. Moreover, memory regions may be compared to peer memory regions to determine when to retire a memory region. The read error mitigation module may trigger a test procedure on a memory region to detect the susceptibility of a memory region to read error failures. By detecting read error failures and retirement of a memory region, data loss and/or data recovery processes may be limited to improve drive performance and reliability.