SSD Zone Allocation Using Wear Levels and Access Counts
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Solution Overview
Problem
SSDs have a shorter lifespan than hard disk drives, necessitating improved management methods to extend their lifespan and reduce wear level differences.
Innovation Solution
A storage system and method that allocate memory blocks to zones based on read/write count information and wear levels, allowing for zone changes and garbage collection to balance wear levels across memory blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If SSDs are used to provide high processing speeds for data center services, then service quality is improved, but the lifespan of the SSDs is reduced due to shorter durability compared to HDDs
Solution Approach 1:
The patent applies local quality by differentiating treatment for different memory blocks based on their wear levels. The storage controller identifies memory blocks with different wear characteristics and manages them differently through zone-based wear leveling, allowing high-speed operations on less worn blocks while protecting more worn blocks, thus extending overall SSD lifespan while maintaining processing speed.
Solution Approach 2:
The patent changes the parameter of memory block management by introducing wear level as a key parameter. The storage controller dynamically adjusts zone assignments and garbage collection priorities based on wear level parameters, enabling the system to optimize both speed and lifespan by adapting management strategies to the actual wear state of memory blocks.
2Speed
If read/write operations are concentrated on specific memory blocks to satisfy service demands, then service responsiveness is improved, but wear level differences between memory blocks increase
Solution Approach 1:
The patent introduces wear level as a dynamic parameter for zone management. The storage controller monitors wear levels of memory blocks and adjusts zone assignments accordingly, changing the parameter of block allocation from static to dynamic based on wear characteristics. This enables the system to maintain service responsiveness while preventing excessive wear concentration.
Solution Approach 2:
The patent implements feedback mechanisms where the storage controller continuously monitors wear levels of memory blocks and uses this information to adjust zone assignments and garbage collection strategies. This closed-loop control ensures that wear level differences are maintained within acceptable ranges while still satisfying service demands for fast access.
3Ease of operation
If traditional garbage collection is performed without considering wear levels, then memory management simplicity is maintained, but wear level differences between memory blocks increase
Solution Approach 1:
The patent applies local quality to garbage collection by treating memory blocks differently based on their wear levels. Instead of uniform garbage collection across all blocks, the system performs wear-aware garbage collection that prioritizes blocks with lower wear levels, thereby extending the lifespan of more worn blocks while maintaining manageable complexity through automated controller logic.
Data Source
AI summary
The present disclosure provides a storage system including: a non-volatile memory configured to include a plurality of memory blocks and a storage controller. The storage controller is configured to receive a zone open request from a host, and to open a second zone to the host including a plurality of second memory blocks among the plurality of memory blocks based on read and write count information of a first zone including a plurality of first memory blocks among the plurality of memory blocks and based on a wear level of the plurality of memory blocks.