Zone Memory Failure Recovery for Cache and Non-Cache Blocks
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Solution Overview
Problem
Conventional zone memory sub-systems face complexities in handling block program failures during data management, leading to potential data loss or corruption, especially in operations involving cache and non-cache blocks, which affect zone data integrity.
Innovation Solution
Implementing a memory sub-system with enhanced mechanisms to handle block program failures by swiftly addressing issues in SLC cache and QLC non-cache blocks, ensuring data integrity through immediate allocation of new blocks, data migration, and marking failed blocks as bad, while maintaining zone data integrity during operations like host data writes and refresh processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zone memory sub-systems handle block program failures using traditional methods, then the system structure remains simple, but data integrity is compromised and recovery time increases
Solution Approach 1:
The patent implements preliminary actions by maintaining a ready pool of spare blocks and pre-establishing failure handling protocols. When a program failure occurs, the system immediately activates pre-defined recovery procedures including identifying the failed block, allocating a replacement block from the spare pool, and migrating data without delays, thus ensuring data integrity while managing complexity through preparation.
Solution Approach 2:
The patent introduces an intermediary failure handling mechanism that acts as a mediator between the memory blocks and the control logic. This intermediary layer manages the complexity by centralizing failure detection, block replacement coordination, and data migration operations, thereby improving reliability without proportionally increasing overall system complexity.
2Loss of time
If the system quickly recovers from program failures by allocating new blocks and migrating data, then downtime is reduced, but the complexity of failure handling increases
Solution Approach 1:
The system performs preliminary actions by pre-allocating spare blocks and establishing migration protocols before failures occur. This allows immediate activation of recovery procedures, reducing recovery time while managing complexity through advance preparation rather than ad-hoc responses.
Solution Approach 2:
The failure handling mechanism implements self-service by automatically detecting program failures, identifying affected blocks, allocating replacements, and executing data migration without external intervention. This automation reduces recovery time and manages complexity by consolidating multiple operations into a self-managed process.
3Reliability
If the system implements comprehensive failure handling for both cache and non-cache blocks, then data integrity is improved, but the operational complexity increases
Solution Approach 1:
The patent applies universality by implementing a unified failure handling mechanism that serves both cache blocks and non-cache blocks through the same procedural framework. This universal approach improves data integrity across all block types while managing operational complexity by avoiding separate specialized procedures for different block categories.
Solution Approach 2:
An intermediary failure handling layer is introduced that manages both cache and non-cache blocks through centralized protocols. This intermediary simplifies operations by providing a uniform interface for failure detection and recovery across different block types, thereby improving reliability without proportionally increasing operational complexity.
Data Source
AI summary
Various embodiments provide handling block program failure in a memory sub-system that supports zones. In particular, some embodiments described herein handle block program failure during a data write (e.g., host data write) to a cache block of a zone on a memory device on a memory sub-system, block program failure during refresh of a cache block of a zone on a memory device on a memory sub-system, block program failure during migration of data between a cache block and a non-cache block of a zone on a memory device on a memory sub-system, block program failure during refresh of a non-cache block of a zone on a memory device on a memory sub-system, or some combination thereof.