Read Channel Buffer Reallocation for Higher Throughput Decoding
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Solution Overview
Problem
Current data storage devices face challenges in minimizing command completion time (CCT) due to sequential retry and error correction processes, which prolong recovery times for failed data blocks, especially in cloud storage environments with stringent CCT requirements.
Innovation Solution
Implementing dynamic read channel buffer management to support multiple decoding schemes concurrently in a single buffer space, allowing for simultaneous retry and recursive read averaging (RRA) processes, and dynamically reallocating buffers during ongoing recovery operations to maximize decoding throughput and reduce recovery time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential retry and error correction processes are used, then recovery algorithms can be applied to failed data blocks, but command completion time increases
Solution Approach 1:
The system performs preliminary actions by pre-populating read channel buffers with data from failed data blocks before the error recovery process is fully initiated. This allows recovery algorithms to immediately process available data without waiting for sequential data retrieval, thereby reducing command completion time while maintaining reliable data recovery capability
Solution Approach 2:
The system maintains continuity of useful action by keeping read channel buffers continuously populated with failed data block information throughout the error recovery process. Instead of sequential processing where buffers are emptied and refilled, the buffers remain actively engaged with recovery data, ensuring uninterrupted processing and reducing overall recovery time
2Reliability
If read channel buffers are held for ongoing error recovery processes, then data recovery can be completed, but buffer resources are unavailable for additional failed data blocks
Solution Approach 1:
The system applies dynamics by implementing a dynamic buffer management mechanism where read channel buffers are automatically released upon successful data recovery and immediately re-populated with data from additional failed data blocks. This dynamic allocation allows the system to adapt buffer resources to current recovery needs, ensuring both recovery completion and continued availability for new failed blocks
Solution Approach 2:
The system discards and recovers buffer resources efficiently by releasing buffer space as soon as data recovery succeeds, then recovering that same buffer space for use with subsequent failed data blocks. This循环利用 of buffer resources maximizes the system's capacity to handle multiple failed blocks simultaneously without compromising recovery completion
Data Source
AI summary
An error recovery process provides for identifying a set of failed data blocks read from a storage medium during execution of a read command, populating sample buffers in a read channel with data of a first subset of the set of failed data blocks, and initiating an error recovery process on the data in the sample buffers. Responsive to successful recovery of one or more data blocks in the first subset, recovered data is released from the sample buffers and sample buffers locations previously-storing the recovered data are repopulated with data of a second subset of the set of failed data blocks. The error recovery process is then initiated on the data of the second subset of the failed data blocks while the error recovery process is ongoing with respect to data of the first subset of failed data blocks remaining in the sample buffers.