Configurable Mapping System for SSD Metadata Management
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Solution Overview
Problem
As data storage capacities increase, managing metadata in solid-state drives (SSDs) becomes inefficient, affecting deterministic I/O performance due to the growing amount of map data needed to describe memory spaces.
Innovation Solution
The implementation of a flexible mapping system in SSDs, where a controller circuit partitions metadata into separate map data sets, each describing a different die set, allowing for dynamic reconfiguration of die sets and efficient power management, using a map manager circuit to maintain and update pointers for efficient data retrieval and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data storage capacity increases, then storage capacity is improved, but metadata management efficiency deteriorates
Solution Approach 1:
The patent divides the metadata management system into multiple die sets, where each die set independently manages its own metadata. This segmentation allows parallel processing of metadata operations across different die sets, preventing the metadata management bottleneck that would occur with a single centralized metadata structure for large storage capacities.
2Quantity of substance
If map data size increases to describe larger memory spaces, then storage capacity is improved, but I/O performance deteriorates
Solution Approach 1:
The patent segments the large memory space into multiple die sets, each with its own smaller map data structure. This allows I/O operations to be distributed across multiple smaller metadata structures rather than accessing a single large map, improving I/O performance while maintaining support for large total storage capacity.
Solution Approach 2:
Each die set maintains local metadata and map data specific to its own memory space. This local quality approach allows each die set to independently manage its metadata without being affected by operations on other die sets, enabling parallel I/O operations and improving overall system performance.
3Adaptability or versatility
If die sets are reconfigured to accommodate varying user requirements, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic die set configurations where the number and composition of die sets can be changed at runtime based on user requirements. The system can dynamically allocate dies to different die sets and reconfigure metadata structures without requiring complete system reinitialization, making the system adaptable while managing complexity through incremental reconfiguration.
Data Source
AI summary
Apparatus and method for managing metadata in a data storage device, such as a solid-state drive (SSD). In some embodiments, a non-volatile memory (NVM) includes a population of semiconductor memory dies. The dies are connected a number of parallel channels such that less than all of the semiconductor dies are connected to each channel. A controller circuit apportions the semiconductor memory dies into a plurality of die sets, with each die set configured to store user data blocks associated with a different user. The controller circuit subsequently rearranges the dies into a different arrangement of die sets so that at least one die is migrated from a first dies set to a second die set. A map manager circuit is configured to establish an array of pointers in a memory to identify contiguous portions of map metadtata that describe user data stored in the at least one migrated die.