Local Data Relocation in Solid-State Storage Devices
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Solution Overview
Problem
Conventional storage systems face performance issues due to increased communication bandwidth consumption when relocating data from memory cells programmed in higher storage density modes, such as QLC, which leads to delays in transmitting user data.
Innovation Solution
Implementing a storage system where the storage device locally relocates data to a new location without sending it to the storage controller, thereby preserving communication bandwidth and improving performance by identifying triggering events like error rates or read counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data is relocated from memory cells programmed in higher storage density modes (e.g., QLC), then storage capacity is improved, but communication bandwidth consumption increases and data transmission delays occur
Solution Approach 1:
The patent extracts the data relocation function from the storage controller and implements it locally within the storage device itself. This allows the storage device to autonomously relocate data between different memory cell regions without involving the storage controller, thereby extracting the bandwidth-consuming data transmission operation from the critical communication path and resolving the contradiction between maintaining high storage capacity and reducing communication bandwidth consumption.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a relocation manager component within the storage device that coordinates local data relocation operations. This intermediary enables the storage device to autonomously manage data movement between high-density and low-density memory regions without requiring controller intervention, thus mediating between the need for high storage capacity and the need to minimize communication bandwidth usage.
2Quantity of substance
If data is relocated from memory cells programmed in higher storage density modes, then storage capacity is improved, but data transmission delays increase
Solution Approach 1:
The patent implements preliminary action by proactively relocating data from high-density memory cells to low-density memory cells before the storage controller needs to access the data. The relocation manager monitors memory cell status and initiates relocation operations in advance, ensuring that data is already in the appropriate location when needed, thereby eliminating access delays while maintaining high storage capacity utilization.
Solution Approach 2:
The storage device performs self-service by autonomously managing its own data relocation operations without external controller intervention. The relocation manager within the storage device independently identifies when relocation is needed and executes the relocation, allowing the storage device to service its own optimization needs and avoid delays caused by controller involvement in the relocation process.
3Loss of energy
If local data relocation is implemented in the storage device, then communication bandwidth is preserved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the relocation manager to perform multiple functions: monitoring memory cell status, determining relocation needs, selecting target locations, and executing data relocation. This multi-functional component consolidates what could be separate complex subsystems into a single integrated unit, preserving communication bandwidth while managing device complexity through functional consolidation rather than proliferation of separate components.
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.