PSU Fan Recovery via Reverse Airflow Mitigation
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Solution Overview
Problem
Power supply units (PSUs) in computer systems can fail due to overheating, especially when stronger system fans create reverse airflow, preventing the PSU fan from operating correctly or restarting, and existing methods lack effective solutions for restoring PSU functionality without additional hardware.
Innovation Solution
A computer-implemented method that monitors PSU status, reduces system fan duty to prevent reverse airflow, and initiates a software-based recovery process, including power-cycling and power-capping, to restore PSU operation without hardware additions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the PSU fan is placed in parallel with stronger system fans to save space, then the computer system can meet space and wiring restrictions, but the stronger system fans create reverse airflow that prevents the PSU fan from operating correctly or restarting
Solution Approach 1:
The system performs preliminary detection of fan operation status and preemptively initiates recovery actions (power-cycling, power-capping) before complete failure occurs, preventing the reverse airflow problem from causing permanent damage to PSU fan reliability
Solution Approach 2:
The system continuously monitors PSU fan operation and uses this feedback to trigger appropriate recovery mechanisms, creating a closed-loop control system that maintains fan reliability despite the challenging parallel placement configuration
2Strength
If the PSU fan operates at less than full capacity due to reverse airflow, then the stronger system fans can continue to provide cooling, but the PSU fan slows down, ceases operating, and fails to restart
Solution Approach 1:
The control system acts as an intermediary between the system fans and PSU fan, detecting when reverse airflow occurs and mediating by power-cycling the PSU fan to reset its operation, thereby restoring restart capability without compromising system cooling capacity
Solution Approach 2:
The system implements periodic monitoring of PSU fan status and applies periodic power-cycling or power-capping actions to prevent the fan from completely failing, maintaining ease of operation through rhythmic intervention
3Device complexity
If no additional hardware is added to detect and resolve PSU fan failure, then the device complexity remains low, but existing methods lack effective solutions for restoring PSU functionality
Solution Approach 1:
The patent replaces potential mechanical or hardware-based detection and recovery mechanisms with software-based control methods (power-cycling, power-capping), achieving ease of repair without increasing hardware complexity
Solution Approach 2:
The PSU fan recovery system is self-service in nature, automatically detecting failures and executing recovery protocols without requiring external hardware intervention or manual intervention, maintaining low device complexity while improving ease of repair
Data Source
Figure 1A~1B
Figure 2
Figure 3A
AI summary
Systems and methods are provided for controlling two or more PSUs of a server system. An exemplary method comprises first determining whether the PSUs are switched on to an AC power source. If the PSUs are found not switched on to an AC power source, the method further comprises restarting the AC power source for the PSUs and completing a software-based recovery process. If the PSUs are found to be switched on to an AC power source, the method further comprises determining whether the PSUs meet a predefined criterion. If the PSUs do meet a predefined criterion, the method further comprises disabling a cold-redundancy mode for the PSUs. If the PSUs do not meet a predefined criterion, the method further comprises starting a wake-up process for a first PSU from a cold-redundancy mode.