Memory Controller SPOR Recovery Using Dummy Flag P2L Tables
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Solution Overview
Problem
Existing memory devices with RAID protection mechanisms face increased processing times during sudden power off events, lacking effective solutions to manage data access and storage efficiently without introducing side effects.
Innovation Solution
A method and apparatus for data access management in a memory device using multi-table control with a dummy flag to enhance sudden power off recovery (SPOR) of page-group-based RAID protection, involving determining damaged page groups, updating physical-to-logical address mapping tables, and writing dummy pages to skip RAID encoding, thereby reducing processing time and ensuring data correctness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RAID protection mechanism is implemented in memory device, then data reliability is improved, but processing time during sudden power off events increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing multiple P2L address mapping tables (first, second, and third tables) before sudden power off events occur. These tables are prepared in advance with different mapping relationships, allowing the system to quickly switch to a pre-configured table during recovery without performing complex real-time calculations, thus reducing processing time while maintaining RAID protection reliability
Solution Approach 2:
The patent segments the address mapping functionality by dividing it into multiple separate P2L tables instead of using a single unified mapping table. This segmentation allows different tables to handle different mapping scenarios independently, enabling faster recovery by selecting appropriate pre-segmented tables during SPO events rather than reconstructing the entire mapping structure
2Reliability
If multiple internal management information tables are maintained for RAID protection, then data correctness is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing multiple P2L address mapping tables that serve different functions but follow the same structural format and management rules. Each table (first, second, third P2L tables) can handle different mapping scenarios universally, allowing the system to maintain data correctness through multiple tables while reducing complexity through standardized multi-functional design
Solution Approach 2:
The patent uses copying by creating multiple copies of the address mapping structure (first P2L table, second P2L table, third P2L table) with slight variations in their mapping relationships. These copied tables provide redundancy for data correctness while simplifying management through consistent structure, avoiding the need for entirely different data structures for different RAID scenarios
Data Source
AI summary
A method for performing data access management of a memory device in predetermined communications architecture to enhance sudden power off recovery (SPOR) of page-group-based redundant array of independent disks (RAID) protection with aid of multi-table control using dummy flag and associated apparatus are provided. The method may include: after occurrence of a sudden power off (SPO) event, utilizing the memory controller to perform a SPOR procedure in response to the SPO event, for example, updating a temporary physical-to-logical (P2L) address mapping table corresponding to a first active block to carry the dummy flag in each P2L table entry of at least one P2L table entry corresponding to at least one set of damaged pages; and after performing the SPOR procedure in response to the SPO event, utilizing the memory controller to write subsequent data into at least one set of subsequent pages in the damaged page group.