Proactive ECC Failure Handling in Open-Channel SSDs
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Solution Overview
Problem
Open-Channel SSD systems face challenges in proactive error-correcting code (ECC) failure handling due to increased error bits in read data, which the host cannot anticipate, leading to inefficient data movement and excessive resource consumption for error correction.
Innovation Solution
A method and apparatus for proactive ECC failure handling, involving the host setting an error-bit threshold, reallocating physical addresses based on error bit counts, and using a completion element to manage data transactions, ensuring that user data is written or read from optimal storage locations to minimize errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the host does not implement proactive ECC failure handling, then the system structure remains simple, but error bits increase and data reliability deteriorates
Solution Approach 1:
The patent implements proactive ECC failure handling by performing preliminary actions: the host reads data from the SSD, detects error bits, and reallocates physical addresses before actual data corruption occurs. This preliminary intervention prevents error propagation and maintains data reliability without requiring complex real-time correction mechanisms during data access operations.
Solution Approach 2:
The patent establishes a feedback mechanism where the host continuously monitors error bit counts in read data from the SSD. Based on this feedback, the host dynamically adjusts by reallocating physical addresses for data that exceeds error thresholds. This closed-loop feedback system maintains data reliability through iterative correction while keeping the overall system architecture relatively simple.
2Reliability
If proactive ECC failure handling is implemented, then data read error frequency decreases, but resource consumption for error correction increases
Solution Approach 1:
The patent employs parameter changes by introducing an error-bit threshold parameter that determines when proactive correction should be triggered. The host monitors error bit counts and only initiates costly data movement operations when the error count exceeds this threshold. This parameter-based approach optimizes resource consumption by avoiding unnecessary corrections while maintaining data reliability through targeted intervention.
3Productivity
If the host cannot anticipate error bits, then the system operation remains simple, but data movement efficiency deteriorates
Solution Approach 1:
The patent implements preliminary action by having the host proactively read data from the SSD, detect error bits, and reallocate physical addresses before actual data corruption or access failures occur. This preliminary detection and correction mechanism improves data movement efficiency by preventing error propagation, while the systematic approach keeps host management complexity manageable through automated monitoring and correction protocols.
Data Source
AI summary
The invention introduces a method for proactive error-correcting code (ECC) failure handling, at least including the following steps: obtaining a completion element (CE) from a completion queue (CQ); determining whether an execution reply table of the CE comprises an unsecure value; if so, reallocating a physical address for a user data transaction corresponding to the unsecure value; and outputting a write command into a submission queue (SQ) for programming the user data transaction into the reallocated physical address.