Dynamic Power Management for Solid State Drives
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Solution Overview
Problem
Existing solid state drive (SSD) power management techniques, such as static calibration-based throttling, result in significant performance loss to accommodate power variations, leading to suboptimal performance within an allocated power budget.
Innovation Solution
A power management system utilizing a power management integrated circuit (PMIC) and built-in self-test (BIST) procedures to dynamically adjust a power consumption cost table, allocating power credits for read, write, and erase operations, ensuring power consumption remains below a maximum acceptable value while maintaining high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static calibration-based throttling is used for power management, then power consumption is controlled within acceptable margins, but SSD performance deteriorates significantly
Solution Approach 1:
The patent applies dynamics by transitioning from static calibration to dynamic power management. The system continuously monitors actual power consumption and adjusts operational parameters in real-time, allowing the SSD to operate at optimal performance levels while staying within power budgets. This dynamic adjustment enables the system to adapt to varying workloads and power conditions, resolving the contradiction between reliable power control and high performance.
Solution Approach 2:
The patent implements feedback mechanisms where the controller monitors actual power consumption and uses this information to adjust operational parameters. The system compares real-time power usage against acceptable thresholds and dynamically modifies performance parameters, creating a closed-loop control system that maintains both power reliability and performance optimization.
2Reliability
If power margins are increased to accommodate variations, then power consumption reliability is improved, but SSD performance is reduced
Solution Approach 1:
The system performs self-characterization by having the SSD controller measure its own actual power consumption during various operations. This self-service approach eliminates the need for conservative static margins by directly observing real power usage patterns, allowing the system to optimize performance based on actual behavior rather than theoretical worst-case scenarios.
Solution Approach 2:
The patent changes operational parameters dynamically based on measured power consumption characteristics. By adjusting parameters such as operational thresholds, timing parameters, and performance limits in response to actual power usage data, the system optimizes the balance between power reliability and performance for each specific operational context.
Data Source
AI summary
A system and method for operating a solid state drive (SSD) within power limitations while maintaining SSD performance. In one embodiment a power management integrated circuit (PMIC) is used to measure power consumption, and a built-in self-test (BIST) procedure is used to exercise the storage device, and to calibrate the power consumed by various SSD operations. The results are stored in a power consumption cost table. In one embodiment, a procedure to dynamically adjust the power consumption cost table is employed. A power credit allocation scheme is used, along with the power consumption cost table, to track and limit the power consumed by the SSD in operation.