Memory Sub-System Data Placement for Low Write Amplification
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Solution Overview
Problem
Existing memory sub-systems face issues with write amplification and performance degradation due to garbage collection and data placement scattering in virtual environments, leading to reduced quality of service and increased interference between virtual machines.
Innovation Solution
Implementing a hardware automation component in the memory sub-system controller to automate the determination of reclaim groups associated with placement handles, reducing firmware involvement and optimizing data placement configurations based on host system requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If garbage collection is performed in virtual environments, then data management is enabled, but write amplification increases and performance degrades
Solution Approach 1:
The memory device is divided into multiple reclaim groups, each associated with a specific placement handle. This segmentation allows targeted garbage collection for specific virtual machine data without affecting other VMs, reducing unnecessary write operations and improving overall write performance while maintaining data management reliability.
2Adaptability or versatility
If data placement scattering occurs in virtual environments, then data management flexibility is improved, but quality of service decreases and interference between virtual machines increases
Solution Approach 1:
Placement handles act as intermediaries between the host system and the memory device. Each placement handle maps to a specific reclaim group, providing a structured intermediary layer that enables flexible data placement while preventing scattering that would cause VM interference and degrade quality of service.
3Ease of operation
If firmware involvement in data placement determination is increased, then data placement control is improved, but device complexity increases
Solution Approach 1:
The data placement determination logic is extracted from the firmware and implemented as hardware automation components within the memory sub-system controller. This extraction reduces firmware involvement while maintaining placement control capability, thereby reducing overall device complexity while preserving ease of operation.
4Productivity
If hardware automation component is implemented, then write amplification is reduced and performance is improved, but device complexity increases
Solution Approach 1:
The hardware automation component is merged with the existing memory sub-system controller architecture, combining the placement handle management and reclaim group association functions within the existing controller structure. This integration achieves performance improvement through hardware automation while minimizing the increase in device complexity by utilizing existing controller resources.
Data Source
AI summary
A system includes a memory device and a memory sub-system controller, operatively coupled with the memory device, to perform operations including: receiving, from a host system, a memory access command having one or more associated parameters; determining, using a hardware component of the memory sub-system controller, whether the one or more associated parameters comply with a current flexible data placement (FDP) configuration of the system; and in response to determining that the one or more associated parameters comply with the current FDP configuration of the system, executing the memory access command on an identified segment of the memory device.