SSD Read Prioritization in Power-Limited Modes
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Solution Overview
Problem
Solid-state drives (SSDs) face latency bottlenecks in power-limited operation modes, where existing read prioritization algorithms fail to effectively reduce Quality of Service (QoS) latency due to performance limitations caused by power constraints.
Innovation Solution
Implementing a multi-stage priority-based servicing scheme within the SSD, utilizing a power management controller and channel controller to prioritize host read commands, manage power allocation, and adjust priority levels, ensuring reduced QoS latency while adhering to power limits by using NVMe over PCIe protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If read prioritization algorithms are implemented in power-limited SSD operation mode, then QoS latency for host read commands is reduced, but power consumption increases
Solution Approach 1:
The patent changes operational parameters by implementing dynamic priority adjustment based on power availability. The system monitors power conditions and adjusts the priority of read commands dynamically, allowing aggressive read prioritization when power is abundant and conservative prioritization when power is constrained, thus resolving the contradiction between reducing latency and managing power consumption
Solution Approach 2:
The system introduces dynamic behavior to the previously static priority scheme. The priority of read commands is no longer fixed but adjusts dynamically based on real-time power conditions. This dynamic adaptation allows the system to optimize QoS latency when power permits while ensuring power constraints are met when energy is limited
2Loss of time
If multi-stage priority-based servicing scheme is implemented to prioritize host read commands, then response time is reduced, but device complexity increases
Solution Approach 1:
The patent segments the priority management function into multiple independent stages: initial priority assignment, power condition monitoring, dynamic priority adjustment, and command scheduling. Each stage is handled by dedicated controller components (power management controller and channel controller), which reduces the complexity burden on any single component while achieving the overall goal of reduced response time
3Use of energy by moving object
If power allocation is restricted to meet power limits, then power consumption is controlled, but productivity of I/O operations decreases
Solution Approach 1:
The system implements periodic monitoring of power conditions and periodic adjustment of command priorities. Instead of continuously throttling I/O operations, the system periodically assesses power availability and adjusts the priority of pending read commands accordingly. This periodic action maintains productivity by allowing batches of operations to proceed when power is available while ensuring power limits are respected during constrained periods
Data Source
AI summary
A reduction in Quality of Service (QoS) latency for host read commands in a power limited operation mode in a storage device is provided. A priority level is assigned to a host command using weighted round robin arbitration. Power resources are allocated based on the priority levels assigned to host commands to minimize host read command latency in the power limited operation mode.