Storage Controller Trim Range Handling for Overlapping Commands
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Solution Overview
Problem
The operational performance of storage devices can degrade when handling new commands from a host device due to the current control state of the controller.
Innovation Solution
The storage device manages information related to commands, such as trim range and state information, and determines how to process new commands based on this managed information, including updating or skipping updates to prevent performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller updates trim range information and trim state information for every trim command received from the host device, then the command processing is thorough and complete, but the operational performance of the storage device degrades due to excessive update operations
Solution Approach 1:
The controller performs updates only when necessary (when the trim region is not included in previously stored trim range information) and skips updates when the trim region is already covered. This partial action approach prevents excessive update operations while ensuring complete processing of necessary trim commands, thereby resolving the contradiction between reliability and productivity
2Reliability
If the controller processes every new command from the host device with full update operations, then all commands are handled uniformly and correctly, but the operational performance degrades due to the current control state
Solution Approach 1:
The controller checks the current trim range information before processing a new trim command and determines whether an update is necessary based on this feedback. This feedback mechanism ensures that commands are handled correctly (maintaining reliability) while avoiding unnecessary updates that would degrade operational performance
Data Source
AI summary
A storage device separately manages trim range information, which indicates a trim region based on a trim command received from a host device, and trim state information, which indicates a progress state of a trim operation for the trim region. The storage device skips updating the trim state information based on the trim range information when a trim command for an overlapping trim region is generated. This approach helps prevent performance degradation in the storage device due to unnecessary updates and trim operations.