NAND Storage Controller Shared Memory Data Migration
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Solution Overview
Problem
NAND-based data storage devices face increased power consumption and write amplification due to garbage collection, which occurs when data is rewritten and invalid blocks are erased, leading to inefficiencies in read and write performances.
Innovation Solution
A data storage device with a shared memory area and a dedicated memory area, where data is stored based on stream class numbers, with the controller allocating memory blocks to minimize power consumption and reduce write amplification by migrating data from a shared memory area to a dedicated memory area based on storage frequency thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data with various stream class numbers are separately stored into each block, then data classification and retrieval efficiency is improved, but power consumption increases and time loss occurs due to separate storage operations
Solution Approach 1:
The patent merges multiple stream class numbers into a single shared memory block instead of separating them into different blocks. The controller stores data with different stream class numbers (first stream class number and second stream class number) together in the same memory block, eliminating the need for separate storage operations and reducing power consumption while maintaining retrieval efficiency through logical separation in control structures
2Productivity
If data is distributed and stored in each storage block of the media, then data organization and access efficiency is improved, but time loss occurs due to divided storage operations
Solution Approach 1:
The patent combines multiple stream class data into a single memory block storage operation. By storing first data with first stream class number and second data with second stream class number in the same memory block, the system reduces the number of separate write operations to the media, thereby reducing time loss while maintaining efficient data organization through controller-managed logical separation
3Reliability
If garbage collection is performed to rewrite valid data and erase invalid blocks, then data management and performance maintenance is improved, but write amplification increases due to multiple internal writes
Solution Approach 1:
The patent performs preliminary classification of data by stream class numbers before storage, organizing data in advance so that future garbage collection operations can be more efficient. By pre-organizing data with associated stream class numbers in memory blocks, the system enables targeted data retrieval during garbage collection, reducing the need to read and rewrite large amounts of valid data and thereby reducing write amplification
Data Source
AI summary
The data storage device including a buffer configured to receive first information including first data and a first stream class number identifying characteristics of the first data and second information including second data and a second stream class number identifying characteristics of the second data and store the first and second information therein, the second stream class number being different from the first stream class number, a non-volatile memory including a shared memory area and a dedicated memory area different from the shared memory area and configured to store the first and second data stored in the buffer, the non-volatile memory, and a controller configured to control the buffer and the non-volatile memory, the controller configured to store the first and second data stored in the shared memory area, and then migrate the first data stored in the shared memory area to the dedicated memory area may be provided.