Server Fan Failure Compensation Using Voltage-Boosted Cooling
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Solution Overview
Problem
In densely packed data center environments, airflow cooling systems for Information Handling Systems (IHSs) face challenges in maintaining optimal temperatures due to fan failures, which can lead to reduced performance and component reliability.
Innovation Solution
A fan failure compensation circuit is implemented, which detects failed fans, identifies functioning fans, and boosts their power to increase airflow output by delivering an additional output voltage, allowing the system to maintain temperature margins even after a fan failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IHS operates in densely packed data center environments with standard cooling systems, then the system can maintain normal operation, but fan failures lead to temperature exceedance and component reliability degradation
Solution Approach 1:
The cooling system is designed with reserve cooling capacity by selecting fans with higher airflow ratings than the minimum required. This over-provisioning creates a buffer that compensates for fan failures, allowing the system to maintain temperature margins even when one or more fans fail during operation in densely packed data centers
2Reliability
If additional cooling capacity is provided to compensate for fan failures, then temperature margins are maintained, but the device complexity and power consumption increase
Solution Approach 1:
The system dynamically adjusts fan operating parameters by delivering elevated voltage to remaining functional fans when failures are detected. This parameter change enables the fans to operate at higher speeds and provide increased airflow without adding physical cooling components, thereby maintaining temperature margins while avoiding increased device complexity
3Reliability
If fan speed is increased to compensate for failures, then airflow output is sufficient to maintain cooling, but power consumption and energy use increase
Solution Approach 1:
The system applies excessive action by delivering voltage levels higher than the standard rated voltage to fans during failure compensation mode. This partial excessive action (elevated voltage only to affected fans only when needed) provides sufficient airflow to maintain cooling while limiting energy increase to specific time periods and specific fans, rather than continuously powering all fans at maximum capacity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures continued operation of IHSs at or below specified temperatures by enhancing airflow output, preventing performance degradation and component failures, and allowing for timely maintenance of failed fans.
Implementation Method 1
configure a fan failure compensation circuit for delivery of additional power to the first plurality of boost fans; and enable an output voltage by the fan failure compensation circuit, wherein the enabled output voltage boosts the airflow output of the first plurality of boost fans
Data Source
AI summary
A system of fans ventilates heated air from within an IHS (Information Handling System), such as a rack-mounted server, when operated during normal conditions at a rated fan speed. A controller detects a failure of a fan of this fan system and identifies the functioning fans of the system. One or more of the functioning fans are selected for boosting by operation of a fan failure compensation circuit that has been configured for delivery of additional power to the selected boost fans. The fan failure compensation circuit delivers an output voltage that boost the airflow output of the system to compensate for the failed fan. By increasing the output voltage by approximately twenty percent, the boosted fans operate at approximately fifteen percent above rated speeds, which has been demonstrated to compensate for a failed fan while avoiding further failures during the expected lifespan of the fan system.