Multi-Meta Die Storage Balancing Open Blocks

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Solution Overview

Problem

Existing data storage devices face challenges in balancing host writes and relocation operations in multi-meta die systems, leading to increased write amplification, data retention issues, and potential host timeouts.

Innovation Solution

The data storage device employs a method to determine a ratio of host writes and relocation operations, aligning the closures of host and relocation blocks, and delaying operations as necessary to ensure alignment, thereby minimizing open relocation blocks and maintaining smooth host performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If relocation operations are performed aggressively to maintain data retention, then data retention is improved, but write amplification increases and host performance deteriorates

Engineering Contradiction:

Improvedata retentionVSAvoidhost performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system dynamically adjusts the ratio of host writes to relocation operations based on real-time conditions. The processor determines an optimal ratio that balances data retention requirements with host performance, allowing the system to adapt between aggressive relocation when needed and conservative operation when host performance is prioritized

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters by controlling the ratio of host writes to relocation operations. By adjusting this ratio parameter, the system can optimize between data retention (higher relocation ratio) and host performance (lower relocation ratio), resolving the contradiction through parameter optimization

Inventive Principle:

Principle #35Parameter changes

2Productivity

If relocation operations are delayed to align block closures, then write amplification is reduced, but data retention may be compromised

Engineering Contradiction:

Improvewrite amplificationVSAvoiddata retention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary determination of the ratio between host writes and relocation operations before executing operations. By calculating and preparing the optimal ratio in advance, the system can align block closures to reduce write amplification while ensuring data retention requirements are met through predetermined operational planning

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the number of open relocation blocks is minimized through alignment, then write amplification decreases, but system complexity increases

Engineering Contradiction:

Improvewrite amplificationVSAvoidoperation coordination

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system uses feedback from the current state of host and relocation blocks to dynamically determine the optimal ratio of operations. The processor monitors block closure status and adjusts the operational ratio accordingly, creating a feedback loop that automatically optimizes write amplification without requiring complex manual coordination

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12307119B1Data storage device and method for multiple meta die balancing

Publication Date: 2025.05.20 SANDISK TECHNOLOGIES LLC

AI summary

A host can write data to and/or read data from a memory in a data storage device. In addition to writing host data in the memory, the data storage device can perform internal data movement/relocation (e.g. for wear leveling). The data storage device and method provided herein can balance host writes and relocation operations in multiple meta die systems by reducing the number of open blocks across the system.