Fast Block Device Dynamic Remapping Wear Reduction
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Solution Overview
Problem
Existing block storage devices face significant performance issues due to slow random writes and limited write life, particularly in NAND flash memory devices, which can lead to premature device failure.
Innovation Solution
The implementation of a Fast Block Device and associated methodology that dynamically remaps data to optimize access and update patterns, converting random writes into linear writes and using smart data structuring to minimize wear and increase device lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If random writes are performed on traditional block storage devices, then data can be written to any location, but write performance becomes slow and device wear increases
Solution Approach 1:
The patent introduces a mapping layer as an intermediary between the application and the physical storage device. This mapping layer translates random logical block addresses into sequential physical block addresses, enabling random write capability while maintaining sequential write performance. The mapping layer dynamically remaps blocks that have been modified since the last mount, allowing the system to achieve both random access adaptability and sequential write speed without direct random physical writes.
2Adaptability or versatility
If random writes are performed on NAND flash memory devices, then data can be updated anywhere, but device lifetime decreases due to increased erase block operations
Solution Approach 1:
The mapping layer serves as a mediator that decouples logical data updates from physical erase block operations. When data is written, the mapping layer tracks the logical block and remaps it to a new physical location only when necessary, rather than performing direct random physical writes. This reduces the number of erase block operations on NAND flash memory, thereby extending device lifetime while maintaining data update flexibility.
Solution Approach 2:
The system performs preliminary tracking of modified blocks during normal operation. The mapping layer maintains information about which logical blocks have been modified since the last mount, allowing it to prepare and execute sequential remapping operations in advance, rather than performing immediate random writes. This preliminary action reduces wear by batching and sequencing the physical write operations.
3Device complexity
If linear mapping is used to translate block numbers to physical addresses, then simple mapping is achieved, but random read performance becomes slow in some devices
Solution Approach 1:
The patent transforms the static linear mapping into a dynamic mapping system. The mapping layer adapts its mapping strategy based on the device characteristics and access patterns. For devices where random reads are slow with linear mapping, the system can dynamically adjust the mapping approach, such as using more sophisticated translation algorithms or caching strategies, while maintaining relatively simple implementation through the mapping layer abstraction.
Data Source
AI summary
A device, memory, method and system directed to fast data storage on a block storage device that reduces operational wear on the device. New data is written to an empty write block with a number of write blocks being reused. A location of the new data is tracked. Metadata associated with the new data is written. A lookup table may be updated based in part on the metadata. The new data may be read based the lookup table configured to map a logical address to a physical address.