Node BMC Fan Table for Rapid Server Rack Heat Dissipation
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Solution Overview
Problem
Current server rack heat dissipation methods are inefficient as they take a long time to adjust fan speed in response to changing CPU and intake vent temperatures, leading to ineffective cooling and potential CPU frequency reduction during high loads.
Innovation Solution
Implementing a fan table within each node BMC to rapidly obtain and adjust fan duty values based on CPU and intake vent temperatures, allowing for timely and effective heat dissipation by controlling fan rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fan table is provided in the RMC responsible for managing the rack, then the centralized control of the rack is achieved, but the response time for fan speed adjustment is long
Solution Approach 1:
The patent divides the centralized RMC control into distributed BMC control units at each node. Each BMC independently manages fan speed for its associated node using local temperature data and fan tables, eliminating the time-consuming data transmission and processing delays in the centralized architecture while maintaining effective heat dissipation control.
Solution Approach 2:
The fan table is pre-configured in each BMC with temperature-to-fan-speed mapping data. When temperature changes occur, the BMC can immediately lookup and adjust fan speed using the pre-prepared fan table without waiting for RMC processing, significantly reducing response time while maintaining centralized policy consistency.
2Adaptability or versatility
If the fan table is provided in the RMC, then the unified management is achieved, but the heat dissipation response is delayed
Solution Approach 1:
The patent segments the unified RMC management into distributed BMC management units. Each BMC independently executes fan speed control based on local node temperature conditions, enabling immediate heat dissipation response while the RMC maintains unified fan table policy configuration, thus achieving both adaptability and reliability.
Solution Approach 2:
The patent implements local quality by enabling each BMC to independently make fan speed decisions based on its local node's temperature conditions rather than waiting for centralized RMC commands. This local autonomy ensures timely heat dissipation response while the RMC maintains unified policy management through the fan table.
3Device complexity
If the fan speed adjustment is controlled centrally by RMC, then the system architecture is simplified, but the CPU temperature control is insufficient during high load
Solution Approach 1:
The patent segments the centralized RMC control into distributed BMC control units that directly monitor and respond to CPU temperature conditions. Each BMC independently adjusts fan speed based on real-time temperature data from its associated CPU, ensuring adequate temperature control during high load while maintaining relatively simple system architecture through the existing BMC infrastructure.
Solution Approach 2:
The patent implements direct feedback control at the BMC level, where each BMC continuously monitors CPU temperature and immediately adjusts fan speed based on the temperature-to-fan-speed mapping in its local fan table. This closed-loop feedback mechanism ensures adequate CPU temperature control during high load conditions without requiring complex centralized control architecture.
Data Source
AI summary
A rack fan speed regulation method based on a fan table provided in a node BMC is provided, which includes: providing a fan table reflecting a rack fan speed regulation policy in a BMC of each node server; acquiring, by the node BMC, a parameter reflecting a heat dissipation condition of a node motherboard; and acquiring, by the node BMC based on the speed regulation policy, a fan rotation speed corresponding to the parameter rapidly. With the rack fan speed regulation method, the node BMC can rapidly obtain parameters reflecting a heat dissipation condition of a node motherboard, and rapidly obtain a corresponding fan rotation speed based on the speed regulation policy. In this case, heat dissipation of the node can be controlled effectively in a timely manner, thereby ensuring heat dissipation of the rack.