Memory Cell Data Resequencing to Reduce Fragmentation
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Solution Overview
Problem
Existing memory sub-systems face inefficiencies due to data fragmentation and increased write amplification when programming data to multiple level memory cells, leading to performance failures and resource consumption issues.
Innovation Solution
A scheme for resequencing data programmed to multiple level memory cells, where host data items are initially programmed to lower memory pages sequentially and then to higher memory pages, with a controller detecting and correcting non-target sequences to minimize fragmentation and optimize data distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data is programmed to multiple level memory cells using conventional methods, then storage capacity is increased, but data fragmentation increases and write amplification increases
Solution Approach 1:
The patent segments the memory cells into different levels (first level memory cells and second level memory cells) with different storage capacities. This segmentation allows the system to optimize data placement across different storage tiers, reducing write amplification while maintaining high storage capacity. The controller selectively places data in appropriate memory cell levels based on access patterns and requirements.
Solution Approach 2:
The patent implements dynamic data resequencing where the controller actively manages and reorders data placement across memory cell levels. The system dynamically adjusts data distribution based on operational conditions, transitioning between different data organization states to minimize fragmentation and write amplification while maximizing storage utilization.
2Quantity of substance
If data is programmed to multiple level memory cells, then storage capacity is increased, but data fragmentation increases
Solution Approach 1:
The controller incorporates feedback mechanisms to monitor data placement patterns and adjust rese quencing operations accordingly. By continuously analyzing write operations and data access patterns, the controller optimizes data distribution across memory cell levels, maintaining data continuity and minimizing fragmentation while preserving enhanced storage capacity.
Solution Approach 2:
The system dynamically maintains data organization through active rese quencing operations that adapt to changing workload conditions. The controller continuously adjusts data placement strategies to prevent fragmentation, ensuring stable data composition across the heterogeneous memory cell structure while maintaining high storage capacity.
3Speed
If conventional data programming methods are used, then programming speed is maintained, but write amplification increases
Solution Approach 1:
By segmenting memory cells into different levels with varying capacities and characteristics, the system can optimize write operations to appropriate tiers. This segmentation enables faster programming by directing data to suitable memory cell levels, reducing unnecessary write amplification operations while maintaining high programming speeds.
Solution Approach 2:
The controller performs preliminary analysis of data characteristics and memory cell availability before programming operations. This preliminary action enables optimal data placement decisions that prevent write amplification, ensuring efficient programming speeds by avoiding redundant write operations and selecting the most appropriate memory cell levels in advance.
Data Source
AI summary
A first set of host data items are programmed to first memory pages residing at a first region of a memory sub-system. A second set of host data items are programmed to second memory pages residing at the first region. A determination is made that a sequence at which the first set of host data items and the second set of host data items are programmed does not correspond to a target sequence associated with the memory sub-system. One or more of the first set of host data items are copied from one or more first memory pages to a second region of the memory sub-system that is allocated to store host data items initially programmed to first memory pages at the memory sub-system. One or more of the second set of host data items are copied from one or more second memory pages to a third region of the memory sub-system to store host data items that are programmed to second pages at the memory sub-system. A sequence of the copied one or more of the first set of host data items at the second region and the copied one or more of the second set of host data items at the third region correspond to the target sequence.