Adaptive ECC Codeword Layout for Solid-State Data Recovery
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Solution Overview
Problem
Solid-state storage devices face performance and security issues due to static, fixed-size error-correction code (ECC) encoding schemes that do not adapt to varying data layouts and storage media characteristics.
Innovation Solution
An adaptive ECC write module generates ECC codeword symbols for storage in solid-state storage arrays, distributing them across multiple columns and using an adaptive write module to stream these symbols, along with a parity module for error correction, allowing for dynamic data arrangement and recovery across independent channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static, fixed-size ECC encoding schemes are used, then device structure compatibility is maintained, but data security and performance deteriorate due to inability to adapt to varying data layouts and storage media characteristics
Solution Approach 1:
The patent implements dynamic ECC encoding where the ECC parameters (code rate, codeword size) are adjusted based on the data layout configuration and storage media characteristics. The system dynamically selects ECC schemes matching different data layouts (e.g., interleaved vs. non-interleaved) and adapts to varying media error rates, replacing static fixed-size encoding with adaptive dynamic encoding.
Solution Approach 2:
The system changes ECC parameters (codeword length, number of check symbols, code rate) according to the specific data layout and storage conditions. Different ECC schemes with varying parameters are selected to match different data layouts and media characteristics, optimizing both security and performance for each configuration.
2Reliability
If static ECC encoding is used, then implementation simplicity is maintained, but error correction efficiency deteriorates due to mismatch with varying storage conditions
Solution Approach 1:
The system automatically selects and configures the appropriate ECC scheme based on detected data layout and storage media characteristics without requiring manual intervention. The controller autonomously adapts ECC parameters to match current operating conditions, enabling self-adjusting error correction efficiency.
Solution Approach 2:
The ECC configuration dynamically adjusts to storage conditions through automated selection of appropriate code parameters. The system transitions from static to dynamic ECC configuration, where encoding parameters change based on real-time detection of data layout and media error characteristics.
3Productivity
If fixed-size ECC codewords are used, then storage layout consistency is maintained, but data recovery efficiency deteriorates due to inability to optimize for different access patterns
Solution Approach 1:
The system varies ECC codeword size and structure parameters according to the specific data recovery scenario and access pattern. Different codeword lengths and check symbol configurations are selected to optimize recovery efficiency for different data layouts and failure modes.
Solution Approach 2:
The ECC encoding is tailored to local data layout characteristics and specific storage conditions. Different portions of the storage media or different data sets may use different ECC configurations optimized for their specific access patterns and error characteristics.
Data Source
AI summary
A storage module is configured to store data segments, such as error-correcting code (ECC) codewords, within an array comprising a plurality of columns. The ECC codewords may comprise ECC codeword symbols. The ECC symbols of a data segment may be arranged in a horizontal arrangement, a vertical arrangement, a hybrid channel arrangement, and/or vertical stripe arrangement within the array. The individual ECC symbols may be stored within respective columns of the array (e.g., may not cross column boundaries). Data of an unavailable ECC symbol may be reconstructed by use of other ECC symbols stored on other columns of the array.