Early Termination Error Recovery in Data Storage
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Solution Overview
Problem
Data storage devices face inefficiencies when encountering read errors due to the need for extensive error recovery operations, which can delay command completion and lead to operational inefficiencies, especially when error recovery time limits are set to prioritize rapid responses over thorough data recovery.
Innovation Solution
Implementing an error management module that sets and enforces error recovery time limits, allowing for early termination of error recovery operations and adding affected storage locations to a scan list for deferred recovery, enabling quicker response to hosts and maintaining operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive error recovery operations are performed, then data recovery reliability is improved, but command completion time increases
Solution Approach 1:
The patent implements dynamic error recovery by adjusting the extent of recovery operations based on real-time conditions. The controller performs initial error recovery operations within a timeout period, and if unsuccessful, transitions to alternative strategies such as reporting the error to the host or attempting recovery during idle periods, rather than always performing exhaustive recovery operations.
Solution Approach 2:
The error recovery process is divided into multiple stages: initial error recovery operations within a timeout period, followed by alternative actions if those fail. The patent segments the recovery process into urgent operations (within timeout) and deferred operations (during idle periods), allowing the system to prioritize command completion while still attempting data recovery.
2Speed
If error recovery operations are terminated early, then system response speed is improved, but data recovery completeness deteriorates
Solution Approach 1:
The patent performs preliminary error recovery operations within a specified timeout period before terminating the command. This preliminary action attempts to recover errors quickly to maintain system response speed, while the timeout threshold ensures that recovery operations are abandoned if they take too long, preventing excessive delays.
Solution Approach 2:
The patent maintains continuous error recovery efforts by attempting recovery during idle periods even after initial timeout. This allows the system to continue useful recovery actions without blocking command processing, maintaining both response speed and recovery completeness through opportunistic recovery attempts.
3Productivity
If error recovery time limit is set low, then operational efficiency is improved, but error recovery capability deteriorates
Solution Approach 1:
The system dynamically adjusts error recovery behavior based on the timeout threshold. When a low timeout is set, the system performs quick initial recovery operations and then transitions to alternative actions, maintaining operational efficiency while preserving the capability to handle errors through multiple strategies rather than relying on a single extended recovery process.
Data Source
AI summary
Systems and methods are disclosed to perform early termination error recovery at a data storage device. A data storage device may be configured to perform error recovery operations in response to encountering an error while executing a host command, and terminate the error recovery operations prior to completion based on an error recovery time limit. Based on early termination of the error recovery operations, the storage device can add a storage location corresponding to the error to a scan list of storage locations on which to perform additional error recovery operations. In some embodiments, the host may set the error recovery time limit.