Command Slot Management for Memory Endurance Groups
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Solution Overview
Problem
In memory devices with multiple endurance groups, there is an imbalance in wear and performance due to uneven usage of command slots, leading to potential starvation of resources for some endurance groups, which affects overall performance and quality of service (QoS).
Innovation Solution
Implementing a controller that manages command slots by allocating them from private and shared pools, ensuring equitable distribution and preventing overuse by one endurance group, thereby maintaining balanced resource availability across all endurance groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If command slots are allocated without management across multiple endurance groups, then one endurance group can access all command slots freely, but other endurance groups may experience resource starvation and performance degradation
Solution Approach 1:
The command slot pool is segmented into multiple subsets, with each subset dedicated to a specific endurance group. This segmentation ensures that each endurance group has guaranteed access to a portion of command slots, preventing resource starvation while maintaining overall system productivity.
Solution Approach 2:
The system dynamically allocates command slots based on real-time conditions. When an endurance group has available command slots, it can process commands; when slots are depleted, the system can reallocate or throttle to maintain quality of service across all endurance groups.
2Productivity
If command slots are shared among all endurance groups, then resource utilization is maximized, but uneven wear patterns and performance imbalance occur
Solution Approach 1:
Command slots are divided into dedicated subsets for each endurance group, creating a stable allocation structure that prevents any single group from monopolizing resources. This segmentation balances wear patterns by ensuring each group operates within its allocated capacity.
Solution Approach 2:
Different endurance groups are assigned different portions of command slots based on their specific wear characteristics and performance requirements. This local differentiation allows each group to operate optimally while maintaining overall system balance.
Data Source
AI summary
A data storage device including a non-volatile memory device including one or more non-volatile memory sets and one or more endurance groups. Each of the endurance groups includes at least one of the non-volatile memory sets. The data storage device includes a controller coupled to the non-volatile memory device. The controller is configured to receive a pending command message from a host interface, where the received pending command message includes a command configured to be executed by a first endurance group of the number of endurance groups. The controller is further configured to determine an assigned command slot for storing the command, where the assigned command slot is selected form one of a private command slot pool associated with the first endurance group or a shared command slot pool, fetch the command from the host device, and store the fetched command in the assigned command slot.