Redundancy Metadata Distribution in Memory Sub-Systems
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Solution Overview
Problem
Conventional memory sub-systems face increased error rates and reduced efficiency due to the concentration of memory cell wear at specific portions, particularly in redundancy metadata storage, leading to unrecoverable data in the event of catastrophic failures.
Innovation Solution
Implementing a redundancy metadata media management scheme that distributes redundancy data across multiple memory devices or portions, using a randomly generated redundancy factor to determine physical addresses for host data and redundancy metadata storage, thereby reducing the load on individual memory devices and minimizing error occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If redundancy metadata is concentrated in specific memory portions, then device complexity is reduced, but error rate increases and reliability decreases
Solution Approach 1:
The patent divides redundancy metadata storage across multiple memory devices or portions rather than concentrating it in a single location. This segmentation distributes the risk of catastrophic failure and reduces error rates by ensuring that redundancy information is not lost if one memory portion fails.
Solution Approach 2:
The patent assigns different storage locations for redundancy metadata based on specific criteria, creating differentiated storage quality across the memory sub-system. This allows optimal placement of redundancy data in reliable memory portions while maintaining overall system reliability.
2Reliability
If redundancy metadata is distributed across multiple memory devices, then reliability increases, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the memory sub-system automatically manages the distribution and retrieval of redundancy metadata without requiring complex external intervention. The system autonomously handles the complexity of distributed storage, maintaining reliability while minimizing the operational burden on the host system.
Solution Approach 2:
The patent creates a universal memory management framework that handles both data storage and redundancy management through integrated processes. This multi-functionality reduces the need for separate complex management systems while maintaining distributed redundancy for improved reliability.
3Stability of the object's composition
If redundancy factor is randomly generated, then data distribution homogeneity improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses random generation of redundancy factors to change the distribution parameters of metadata across memory devices. This randomization achieves uniform data distribution and load balancing while the system maintains precision through structured address calculation methods that accommodate the random factors.
Data Source
AI summary
A request is received to program host data to a memory device of a memory sub-system. The host data is associated with a logical address. A redundancy factor that corresponds to the logical address associated with the host data is obtained. A first physical address associated with a first set of cells of the memory device and a second physical address associated with a second set of cells of the memory device are determined based on the redundancy factor. The first set of memory cells is to store the host data and the second set of memory cells is to store redundancy metadata associated with the host data. The host data is programmed to the first set of memory cells. The redundancy metadata associated with the host data is programmed to the second set of memory cells.