CN113849056B - Fan control method and server - Google Patents

Fan control method and server Download PDF

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Publication number
CN113849056B
CN113849056B CN202111118214.5A CN202111118214A CN113849056B CN 113849056 B CN113849056 B CN 113849056B CN 202111118214 A CN202111118214 A CN 202111118214A CN 113849056 B CN113849056 B CN 113849056B
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pwm signal
bmc
pulse width
cpld
fan
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CN113849056A (en
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雷鸣春
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New H3C Technologies Co Ltd
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New H3C Technologies Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • G06F1/206—Cooling means comprising thermal management
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The application provides a fan control method and a server. The server comprises a BMC, a CPLD, a monitoring point and a fan for radiating the monitoring point, wherein the CPLD controls a first PWM signal generated by the BMC to be output to the fan; the monitoring point is further provided with a thermistor which is used for sensing the temperature change of the monitoring point and is connected with a pulse width modulation module included in the server; the pulse width modulation module outputs a second PWM signal corresponding to the electric signal according to the electric signal obtained by the thermistor, wherein the electric signal is related to the resistance value of the thermistor along with the temperature change; when the BMC abnormality is detected, the CPLD controls the PWM signal output to the fan to be switched from the first PWM signal to the second PWM signal. It can be seen that the fan rotating speed can be dynamically regulated under the abnormal condition of the BMC, and the energy consumption of the server can be effectively reduced.

Description

Fan control method and server
Technical Field
The present disclosure relates to the field of computer technologies, and in particular, to a fan control method and a server.
Background
The operation of the server generates a large amount of heat, and in order to avoid abnormal operation of the server caused by overhigh temperature, a fan is usually installed in the server to radiate heat of the server. The rotating speed of the fan can be dynamically adjusted so as to reduce the energy consumption of the server as much as possible under the condition of meeting the running requirement of the server.
At present, the control of the fan is mainly realized by a baseboard management controller (English: baseboard Manager Controller, abbreviated: BMC) in the server. The BMC senses the current temperature of the server through a temperature sensor in the server, calculates the target rotating speed of the fan according to the difference between the current temperature and the target control temperature, calculates the pulse width modulation (English: pulse width modulation, abbreviated: PWM) pulse width duty ratio required for reaching the target rotating speed according to the target rotating speed, and finally outputs a PWM signal of the pulse width duty ratio to the fan to realize fan control.
When the BMC is abnormal, the fan cannot be controlled. At this point, control of the fan may be taken over by a complex programmable logic device (English: complex Programmable Logic Device, abbreviated: CPLD) within the server. However, the CPLD is a logic circuit, which does not have a complex computing capability, and therefore, a mode of outputting a PWM signal with a fixed pulse width duty cycle is generally adopted to directly control the fan to operate at the maximum rotation speed, so as to achieve the purpose of heat dissipation, which undoubtedly increases the energy consumption of the server.
Disclosure of Invention
In view of this, the present application proposes a fan control method and a server for effectively reducing the energy consumption of the server when the BMC is abnormal.
In order to achieve the purposes of the application, the application provides the following technical scheme:
in a first aspect, the present application provides a fan control method, applied to a server, where the server includes a BMC, a CPLD, a monitoring point to be cooled, and a fan for cooling the monitoring point, where the CPLD controls to output a first PWM signal generated by the BMC to the fan, where the monitoring point is further configured with a thermistor, and the thermistor is configured to sense a temperature change of the monitoring point and is connected to a pulse width modulation module included in the server, where the method includes:
the pulse width modulation module outputs a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, wherein the electric signal is related to the resistance value of the thermistor along with the temperature change;
when the BMC is detected to be abnormal, the CPLD controls the PWM signal output to the fan to be switched from the first PWM signal to the second PWM signal.
Optionally, the pulse width modulation module is further configured to receive a third PWM signal output by the CPLD, where the third PWM signal is a PWM signal with a fixed pulse width duty cycle, and the pulse width modulation module outputs a second PWM signal corresponding to the electrical signal according to the electrical signal obtained through the thermistor, and includes:
and the pulse width modulation module performs pulse width modulation on the third PWM signal output by the CPLD according to the electric signal obtained through the thermistor to obtain the second PWM signal.
Optionally, after the CPLD controls the PWM signal output to the fan to be switched from the first PWM signal to the second PWM signal, the method further includes:
when the BMC is detected to be recovered to be normal, the CPLD controls the PWM signal output to the fan to be switched from the second PWM signal to the first PWM signal.
Optionally, the detecting the BMC exception includes:
and when the CPLD continuously detects the heartbeat signal sent by the BMC for a first preset time, determining that the BMC is abnormal.
Optionally, the method further comprises:
and restarting the BMC when the CPLD continuously detects heartbeat signals sent by the BMC for a second preset time, wherein the second preset time is greater than the first preset time.
In a second aspect, the present application provides a server, where the server includes a BMC, a CPLD, a monitoring point to be cooled, and a fan for cooling the monitoring point, where the monitoring point is further configured with a thermistor, and the thermistor is configured to sense a temperature change of the monitoring point and is connected to a pulse width modulation module included in the server;
the CPLD is used for controlling the first PWM signal generated by the BMC to be output to the fan;
the pulse width modulation module is used for outputting a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, wherein the electric signal is related to the resistance value of the thermistor along with the temperature change;
the CPLD is also used for controlling the PWM signal output to the fan to be switched from the first PWM signal to the second PWM signal when the BMC abnormality is detected.
Optionally, the pulse width modulation module is further configured to receive a third PWM signal output by the CPLD, where the third PWM signal is a PWM signal with a fixed pulse width duty cycle;
the pulse width modulation module outputs a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, and the pulse width modulation module comprises:
and carrying out pulse width modulation on the third PWM signal output by the CPLD according to the electric signal obtained by the thermistor to obtain the second PWM signal.
Optionally, the CPLD is further configured to control switching a PWM signal to be output to the fan from the second PWM signal to the first PWM signal when the BMC is detected to return to normal.
Optionally, the CPLD detects the BMC exception, including:
and when the CPLD continuously detects the heartbeat signal sent by the BMC for a first preset time, determining that the BMC is abnormal.
Optionally, the CPLD is further configured to restart the BMC when the heartbeat signal sent by the BMC is not detected continuously for a second preset number of times, where the second preset number of times is greater than the first preset number of times.
As can be seen from the above description, in the embodiment of the present application, the characteristic that the resistance value of the thermistor changes with temperature is used as the input of the pulse width modulation module, and the pulse width modulation module outputs PWM signals with different pulse width duty ratios according to the input signal that changes with temperature. When the BMC is abnormal, the CPLD controls the PWM signal output by the pulse width modulation module to be output to the fan so as to adjust the rotating speed of the fan and radiate heat of a monitoring point where the thermistor is located. It can be seen that the method and the device can still realize dynamic adjustment of the rotating speed of the fan under the abnormal condition of the BMC, so that the energy consumption of the server can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a server according to an embodiment of the present application;
FIG. 2 is a schematic diagram of PWM signals and fan speeds according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a fan control method according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the application. As used in the embodiments of the present application, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in embodiments of the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the negotiation information may also be referred to as second information, and similarly, the second information may also be referred to as negotiation information, without departing from the scope of embodiments of the present application. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
Referring to fig. 1, a schematic server structure is shown in an embodiment of the present application. The server comprises a BMC, a CPLD, a pulse width modulation module, a fan, a monitoring point, a change-over switch and a thermistor.
The monitoring point can be any position needing to be monitored and radiating in the server, such as a central processing unit (Central Processing Unit, CPU), an air outlet and the like; the thermistor is arranged near the monitoring point and is used for sensing the temperature change of the monitoring point and inputting the sensed electric signal along with the temperature change into the pulse width modulation module.
When the BMC operates normally, the BMC can collect the temperature of the monitoring point through a temperature sensor (arranged near the monitoring point and not shown in fig. 1), calculate the target rotating speed of the fan according to the difference between the actually measured temperature and the thought target temperature, determine the PWM pulse width duty ratio required for reaching the target rotating speed according to the target rotating speed, and output a PWM signal corresponding to the PWM pulse width duty ratio.
Here, the PWM signal output by the BMC is referred to as a first PWM signal, for example, PWM signal 1 in fig. 1. It will be appreciated that the reference to the first PWM signal is for convenience of distinction and is not intended to be limiting.
When the CPLD detects that the BMC runs normally, the change-over switch is controlled to be switched to the BMC side, and PWM signals output by the BMC are output to the fan, so that the purpose of controlling the rotating speed of the fan to radiate heat of the monitoring point is achieved.
Referring to fig. 2, a schematic diagram of PWM signals and fan rotation speed is shown in an embodiment of the present application. As can be seen from fig. 2, the larger the pulse width duty ratio (the ratio of the pulse width to the period of time to the period T) is, the higher the corresponding fan rotation speed is.
When the BMC is running abnormally, such as when the BMC fails to hang up, or when the BMC system resources are occupied higher, the BMC may not be able to control the fan. At this time, the fan control flow shown in fig. 3 may be executed.
As shown in fig. 3, the process may include the steps of:
in step 301, the pulse width modulation module outputs a second PWM signal corresponding to the electric signal obtained through the thermistor.
The thermistor has temperature sensitivity, the resistance value of the thermistor can change obviously along with the change of temperature, and the change of the resistance value can enable the pulse width modulation module to receive different electric signals, in other words, the pulse width modulation module can receive different electric signals reflecting the temperature change of the monitoring point. The pulse width modulation module outputs PWM signals respectively corresponding to the different electric signals according to the different electric signals.
Here, the PWM signal output by the pulse width modulation module is referred to as a second PWM signal, for example, PWM signal 2 in fig. 1. It will be appreciated that the term second PWM signal is used for convenience of distinction and is not intended to be limiting.
In step 302, when the CPLD detects a BMC abnormality, the CPLD controls to switch the PWM signal output to the fan from the first PWM signal to the second PWM signal.
For example, in fig. 1, the CPLD may control the switch to the PWM module side to output the PWM signal 2 output by the PWM module to the fan. That is, the fan is controlled by the pulse width modulation module when the BMC is abnormal.
Because the PWM module can output PWM signals (PWM signals with different pulse width duty ratios) which change along with temperature, the dynamic adjustment of the rotating speed of the fan can be realized.
Thus, the flow shown in fig. 3 is completed.
As can be seen from the flow shown in fig. 3, in the embodiment of the present application, the characteristic that the resistance value of the thermistor changes with temperature is used as the input of the pulse width modulation module, and the pulse width modulation module outputs PWM signals with different pulse width duty ratios according to the input signal that changes with temperature. When the BMC is abnormal, the CPLD controls the PWM signal output by the pulse width modulation module to be output to the fan so as to adjust the rotating speed of the fan and radiate heat of a monitoring point where the thermistor is located. That is, under abnormal BMC conditions, the fan can be dynamically regulated, so that the energy consumption of the server can be effectively reduced.
As one embodiment, the pulse width modulation module in step 301 outputs, according to an electrical signal obtained based on a thermistor, a second PWM signal corresponding to the electrical signal, and specifically includes:
the pulse width modulation module receives a PWM signal with fixed pulse width duty ratio output by the CPLD. Here, the PWM signal of the fixed pulse width duty cycle output by the CPLD is referred to as a third PWM signal, for example, PWM signal 3 in fig. 1. It will be appreciated that the third PWM signal is referred to herein for ease of distinction and is not intended to be limiting.
The pulse width modulation module performs pulse width modulation on the third PWM signal according to the received electrical signal which changes along with the temperature, namely, changes the pulse width duty ratio of the third PWM signal so as to obtain a modulated second PWM signal which can change along with the temperature.
It can be seen that in the embodiment of the present application, the PWM signal with a fixed pulse width duty ratio output by the CPLD is used as a reference, and the PWM signal capable of controlling different fan speeds can be output by the pulse width modulation module by changing the pulse width duty ratio of the reference PWM signal.
As one example, after performing step 302, if the CPLD detects that the BMC is restored to normal, it may control to switch the PWM signal output to the fan from the second PWM signal to the first PWM signal. For example, in fig. 1, the CPLD may control the change-over switch to switch from the PWM module side to the BMC side, and the PWM signal output by the BMC controls the fan speed, i.e., resumes the BMC controlling the fan.
As an embodiment, in the embodiment of the present application, the CPLD may detect the running state of the BMC based on the heartbeat signal periodically sent by the BMC. Specifically, if the CPLD continuously detects no heartbeat signal sent by the BMC for a first preset number of times (for example, 3 times), the BMC is considered abnormal; otherwise, if the heartbeat signal sent by the BMC is detected, the BMC is considered to be normal.
Here, the first preset number is a name given for convenience of distinction, and is not limited thereto.
As another embodiment, if the CPLD continuously detects no heartbeat signal sent by the BMC for a second preset number of times (e.g., 10 times), which indicates that the BMC cannot repair the abnormal state by itself, the BMC is restarted to attempt to make the BMC operate normally. Here, it should be noted that the second preset number of times is larger than the first preset number of times. It will be appreciated that this second preset number is merely a naming for ease of distinction and is not intended to be limiting.
The method provided by the embodiment of the present application is described above, and the following describes a server provided by the embodiment of the present application:
the server comprises a BMC, a CPLD, a monitoring point to be cooled and a fan for cooling the monitoring point, wherein the monitoring point is further provided with a thermistor, and the thermistor is used for sensing the temperature change of the monitoring point and is connected with a pulse width modulation module included in the server;
the CPLD is used for controlling the first PWM signal generated by the BMC to be output to the fan;
the pulse width modulation module is used for outputting a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, wherein the electric signal is related to the resistance value of the thermistor along with the temperature change;
the CPLD is also used for controlling the PWM signal output to the fan to be switched from the first PWM signal to the second PWM signal when the BMC abnormality is detected.
As an embodiment, the pulse width modulation module is further configured to receive a third PWM signal output by the CPLD, where the third PWM signal is a PWM signal with a fixed pulse width duty cycle;
the pulse width modulation module outputs a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, and the pulse width modulation module comprises:
and carrying out pulse width modulation on the third PWM signal output by the CPLD according to the electric signal obtained by the thermistor to obtain the second PWM signal.
As an embodiment, the CPLD is further configured to control switching the PWM signal output to the fan from the second PWM signal to the first PWM signal when the BMC is detected to return to normal.
As one embodiment, the CPLD detecting the BMC exception includes:
and when the CPLD continuously detects the heartbeat signal sent by the BMC for a first preset time, determining that the BMC is abnormal.
As an embodiment, the CPLD is further configured to restart the BMC when no heartbeat signal sent by the BMC is detected for a second preset number of times, where the second preset number of times is greater than the first preset number of times.
As can be seen from the above description, in the embodiment of the present application, the characteristic that the resistance value of the thermistor changes with temperature is used as the input of the pulse width modulation module, and the pulse width modulation module outputs PWM signals with different pulse width duty ratios according to the input signal that changes with temperature. When the BMC is abnormal, the CPLD controls the PWM signal output by the pulse width modulation module to be output to the fan so as to adjust the rotating speed of the fan and radiate heat of a monitoring point where the thermistor is located. It can be seen that the method and the device can still realize dynamic adjustment of the rotating speed of the fan under the abnormal condition of the BMC, so that the energy consumption of the server can be effectively reduced.
The foregoing description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention to the precise form disclosed, and thus, any modification, equivalents, and alternatives falling within the spirit and scope of the embodiments are intended to be included within the scope of the invention.

Claims (10)

1. The utility model provides a fan control method, which is characterized in that is applied to the server, the server includes baseboard management controller BMC, complicated programmable logic device CPLD, wait radiating monitoring point and be used for carrying out radiating fan to this monitoring point, CPLD control with the first pulse width modulation PWM signal that BMC produced export to the fan, the monitoring point still disposes thermistor, the thermistor is used for the perception the temperature variation of monitoring point to with the pulse width modulation module connection that the server included, the method includes:
the pulse width modulation module outputs a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, wherein the electric signal is related to the resistance value of the thermistor along with the temperature change;
when the BMC is detected to be abnormal, the CPLD control switches the PWM signal output to the fan from the first PWM signal to the second PWM signal so that the pulse width modulation module controls the fan.
2. The method of claim 1, wherein the pulse width modulation module is further configured to receive a third PWM signal output by the CPLD, the third PWM signal being a PWM signal with a fixed pulse width duty cycle, the pulse width modulation module outputting a second PWM signal corresponding to the electrical signal based on the electrical signal obtained via the thermistor, and comprising:
and the pulse width modulation module performs pulse width modulation on the third PWM signal output by the CPLD according to the electric signal obtained through the thermistor to obtain the second PWM signal.
3. The method of claim 1, wherein after the CPLD control switches the PWM signal output to the fan from the first PWM signal to the second PWM signal, the method further comprises:
when the BMC is detected to be recovered to be normal, the CPLD controls the PWM signal output to the fan to be switched from the second PWM signal to the first PWM signal.
4. The method of claim 1, wherein the detecting the BMC exception comprises:
and when the CPLD continuously detects the heartbeat signal sent by the BMC for a first preset time, determining that the BMC is abnormal.
5. The method of claim 4, wherein the method further comprises:
and restarting the BMC when the CPLD continuously detects heartbeat signals sent by the BMC for a second preset time, wherein the second preset time is greater than the first preset time.
6. The server is characterized by comprising a baseboard management controller BMC, a complex programmable logic device CPLD, a monitoring point to be cooled and a fan for cooling the monitoring point, wherein the monitoring point is further provided with a thermistor for sensing the temperature change of the monitoring point and is connected with a pulse width modulation module included in the server;
the CPLD is used for controlling the output of a first Pulse Width Modulation (PWM) signal generated by the BMC to the fan;
the pulse width modulation module is used for outputting a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, wherein the electric signal is related to the resistance value of the thermistor along with the temperature change;
and the CPLD is also used for controlling the PWM signal output to the fan to be switched from the first PWM signal to the second PWM signal when the BMC abnormality is detected, so that the pulse width modulation module controls the fan.
7. The server according to claim 6, wherein:
the pulse width modulation module is further configured to receive a third PWM signal output by the CPLD, where the third PWM signal is a PWM signal with a fixed pulse width duty cycle;
the pulse width modulation module outputs a second PWM signal corresponding to the electric signal according to the electric signal obtained through the thermistor, and the pulse width modulation module comprises:
and carrying out pulse width modulation on the third PWM signal output by the CPLD according to the electric signal obtained by the thermistor to obtain the second PWM signal.
8. The server according to claim 6, wherein:
and the CPLD is also used for controlling the PWM signal output to the fan to be switched from the second PWM signal to the first PWM signal when the BMC is detected to be recovered to be normal.
9. The server of claim 6, wherein the CPLD detecting the BMC exception comprises:
and when the CPLD continuously detects the heartbeat signal sent by the BMC for a first preset time, determining that the BMC is abnormal.
10. The server according to claim 9, wherein:
the CPLD is further configured to restart the BMC when a heartbeat signal sent by the BMC is not detected continuously for a second preset number of times, where the second preset number of times is greater than the first preset number of times.
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