Solid-State Storage Device Local Data Relocation
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Solution Overview
Problem
Conventional storage systems face performance degradation due to increased communication bandwidth consumption for data relocation, especially when using higher storage density modes like QLC, which requires more frequent relocation operations, thereby delaying user data transmission.
Innovation Solution
Implementing a storage device capability to locally relocate data to a new location within the storage device without transmitting it to the controller, using triggering events like error rates, read counts, or time thresholds, and sending only necessary indications to the controller for decision-making.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data relocation is performed through the controller, then data can be moved to new locations, but communication bandwidth consumption increases and performance degrades
Solution Approach 1:
The storage device is empowered to perform data relocation operations autonomously without requiring controller intervention. The storage device monitors its own data blocks, identifies relocation needs based on error rates or other criteria, and executes relocation by writing data to new locations directly, thereby eliminating communication bandwidth consumption for relocation operations
Solution Approach 2:
The data relocation function is extracted from the controller and transferred to the storage device itself. This separation removes the burden of relocation operations from the controller's communication channel, allowing the controller to focus on user data transmission while the storage device handles its own maintenance operations
2Quantity of substance
If higher storage density modes like QLC are used, then storage capacity increases, but relocation frequency increases and performance decreases
Solution Approach 1:
The storage device autonomously manages relocation operations for high-density storage modes, monitoring error rates and performing relocations without controller involvement. This self-management prevents relocation operations from interfering with user data transmission performance while maintaining the benefits of high storage density
Solution Approach 2:
The storage device performs relocation operations proactively based on monitored conditions such as error rates or read counts, before these issues impact user data transmission. By anticipating and addressing relocation needs in advance, the system maintains optimal performance for user operations
Data Source
AI summary
A priority queue including an order of local data relocation operations to be performed by a plurality of solid-state storage devices is maintained. An indication of a new local data relocation operation is received from a solid-state storage device of the plurality of solid-state storage devices for data stored at the solid-state storage device, the indication including information associated with the data. The new local data relocation operation is inserted into a position in the order of the priority queue based on the information associated with the data.