Nonvolatile Memory Controller Read Optimization
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Solution Overview
Problem
Current data storage devices using memory devices face challenges in optimizing read operations across varying workloads, leading to suboptimal performance due to the lack of efficient strategies for handling overlapping read commands and group operations.
Innovation Solution
A data storage device and operating method that selectively apply cache read and interleaving read operations based on the overlap of read regions across multiple groups, allowing for parallel data read and output operations within the same or different groups, thereby optimizing processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plane interleaving read operation is performed to increase random read performance, then read performance is improved, but device complexity increases due to need for group management and overlap detection
Solution Approach 1:
The memory device is divided into multiple groups, each containing one or more planes, with each group operating as an independent interleaving unit. This segmentation allows the controller to manage read operations at the group level, reducing complexity compared to managing individual planes while maintaining parallel read performance benefits.
Solution Approach 2:
The controller performs preliminary checking to determine whether read commands overlap before executing read operations. By pre-determining the relationship between current and previous read groups, the controller can select the optimal read mode (cache read or interleaving read) in advance, avoiding complex real-time decisions during data retrieval.
2Productivity
If cache read operation is performed to increase full page read performance, then read performance is improved, but processing time increases when read regions overlap
Solution Approach 1:
The system dynamically switches between cache read mode and interleaving read mode based on the detected overlap between read commands. When read regions do not overlap, cache read is used for optimal full page performance. When overlap is detected, the system transitions to interleaving read mode to prevent conflicts and reduce processing time, making the system adaptable to varying workload conditions.
3Productivity
If interleaving read operation is performed on planes across multiple groups, then parallel read performance is improved, but data conflicts occur when read regions overlap
Solution Approach 1:
The controller continuously monitors the read command queue and provides feedback about overlapping read regions. Based on this feedback, the controller determines whether to execute read operations in cache read mode or interleaving read mode, ensuring that data conflicts are avoided while maximizing parallel read performance when safe to do so.
Data Source
AI summary
A data storage device may include: a nonvolatile memory apparatus including a plurality of groups configured by dividing a plurality of planes in interleaving units; and a controller configured to check whether a group including a read region of a current read command is included in a group including a read operation of a previous read command and whether the read region of the current read command extends over two or more groups, when receiving the current read command, and control the nonvolatile memory apparatus to perform cache read or interleaving read based on the check result.