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#!/usr/bin/perl
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use strict;
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use warnings;
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use List::Util qw[min max];
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# This script controls SuperMicro server fan speeds via IPMI in response to CPU and SYS temperatures.
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# A fork of https://github.com/missmah/ipmi_tools by Layla Mah <layla@insightfulvr.com>
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# Sensor treshold reset to allow slower fans
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`ipmitool sensor thresh FANA lower 0 100 200`;
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`ipmitool sensor thresh FANB lower 0 100 200`;
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`ipmitool sensor thresh FAN1 lower 0 100 200`;
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`ipmitool sensor thresh FAN2 lower 0 100 200`;
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`ipmitool sensor thresh FAN3 lower 0 100 200`;
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`ipmitool sensor thresh FAN4 lower 0 100 200`;
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`ipmitool sensor thresh FAN5 lower 0 100 200`;
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my $min_temp_change = 4; # *C minimum change to actually cause a fan speed update
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my $seconds_to_sleep = 3; # Number of seconds to sleep between update loops
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# CPU Temp -> Fan Speed Mappings
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my %cpu_temp_to_fan_speed;
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$cpu_temp_to_fan_speed{75} = 0x64;
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$cpu_temp_to_fan_speed{70} = 0x60;
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$cpu_temp_to_fan_speed{65} = 0x54;
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$cpu_temp_to_fan_speed{60} = 0x52;
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$cpu_temp_to_fan_speed{50} = 0x44;
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$cpu_temp_to_fan_speed{40} = 0x40;
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# SYS Temp -> Fan Speed Mappings
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my %sys_temp_to_fan_speed;
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$sys_temp_to_fan_speed{55} = 0x64;
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$sys_temp_to_fan_speed{50} = 0x50;
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$sys_temp_to_fan_speed{45} = 0x44;
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$sys_temp_to_fan_speed{40} = 0x40;
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# Below this line follows the actual implementation of the script
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my $g_current_fan_duty_cycle = 0;
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my $g_current_sys_temp = 0;
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my $g_current_cpu_temp = 0;
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my $g_last_set_cpu_temp = 0;
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my $g_last_set_sys_temp = 0;
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sub Internal_DoSetFanSpeedSys {
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my ( $fan_speed ) = @_;
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`ipmitool raw 0x30 0x70 0x66 0x01 0x01 $fan_speed`;
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}
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sub Internal_DoSetFanSpeedCpu {
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my ( $fan_speed ) = @_;
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`ipmitool raw 0x30 0x70 0x66 0x01 0x00 $fan_speed`;
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}
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sub SetFanSpeed {
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my ( $fan_speed ) = @_;
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my $cpu_temp_difference = $g_current_cpu_temp - $g_last_set_cpu_temp;
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my $sys_temp_difference = $g_current_sys_temp - $g_last_set_sys_temp;
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if( (abs $cpu_temp_difference) > $min_temp_change ) {
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print "We last updated fan speed $cpu_temp_difference *C ago (CPU Temperature).\n";
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print "Current CPU Temperature is $g_current_cpu_temp *C, setting CPU Fan Speed to $fan_speed\n";
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$g_last_set_cpu_temp = $g_current_cpu_temp;
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$g_current_fan_duty_cycle = $fan_speed;
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Internal_DoSetFanSpeedCpu( $fan_speed );
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}
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if( (abs $sys_temp_difference) > $min_temp_change ) {
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print "We last updated fan speed $sys_temp_difference *C ago (SYS Temperature).\n";
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print "Current SYS Temperature is $g_current_sys_temp *C, setting SYS Fan Speed to $fan_speed\n";
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$g_last_set_sys_temp = $g_current_sys_temp;
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$g_current_fan_duty_cycle = $fan_speed;
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Internal_DoSetFanSpeedSys( $fan_speed );
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}
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}
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sub UpdateFanSpeed {
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# Gather statistics for fan speed and CPU Temp and stuch
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my $ipmi_output = `ipmitool sdr list full`;
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my @vals = split( "\n", $ipmi_output );
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my $current_cpu_temp = 0;
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my $current_sys_temp = 0;
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foreach my $value (@vals) {
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if( $value =~ /^(CPU\sTemp).*\s(\d+)\s.*degrees\sC.*/gi ) {
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my $cpu_temp = $2;
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$current_cpu_temp = max( $cpu_temp, $current_cpu_temp );
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}
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if( $value =~ /^(System\sTemp).*\s(\d+)\s.*degrees\sC.*/gi ) {
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my $sys_temp = $2;
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$current_sys_temp = max( $sys_temp, $current_sys_temp );
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}
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} # foreach my $value (@vals)
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$g_current_cpu_temp = $current_cpu_temp;
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$g_current_sys_temp = $current_sys_temp;
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my $desired_fan_speed_cpu = 0x0;
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my $desired_fan_speed_sys = 0x0;
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my @cpu_temps = keys %cpu_temp_to_fan_speed;
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for my $cpu_temp (@cpu_temps) {
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if( $current_cpu_temp > $cpu_temp ) {
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# If the current CPU temperature is higher than the temperature enumerated by this hash lookup,
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# Then set the desired fan speed (if our value is larger than the existing value)
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$desired_fan_speed_cpu = max( $cpu_temp_to_fan_speed{ $cpu_temp }, $desired_fan_speed_cpu );
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# print "The fan speed setting for CPU Temp $cpu_temp *C is $cpu_temp_to_fan_speed{$cpu_temp} % duty cycle\n";
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}
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}
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my @sys_temps = keys %sys_temp_to_fan_speed;
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for my $sys_temp (@sys_temps) {
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if( $current_sys_temp > $sys_temp ) {
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# If the current gPU temperature is higher than the temperature enumerated by this hash lookup,
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# Then set the desired fan speed (if our value is larger than the existing value)
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$desired_fan_speed_sys = max( $sys_temp_to_fan_speed{ $sys_temp }, $desired_fan_speed_sys );
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# print "The fan speed setting for GPU Temp $sys_temp *C is $sys_temp_to_fan_speed{$sys_temp} % duty cycle\n";
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}
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}
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if( $desired_fan_speed_cpu == 0x0 ) {
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print "\n***** ERROR: Failed to determine a desired fan speed. Forcing CPU fans to 100% duty cycle as a safety fallback measure. *****\n";
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$desired_fan_speed_cpu = 0x64;
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}
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if( $desired_fan_speed_sys == 0x0 ) {
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print "\n***** ERROR: Failed to determine a desired fan speed. Forcing SYS fans to 100% duty cycle as a safety fallback measure. *****\n";
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$desired_fan_speed_sys = 0x64;
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}
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#print "Current Fan Duty Cycle: $g_current_fan_duty_cycle%\n";
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#print "Desired CPU Fan Duty Cycle: $desired_fan_speed_cpu%\n";
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#print "Desired SYS Fan Duty Cycle: $desired_fan_speed_sys%\n";
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SetFanSpeed( $desired_fan_speed_cpu );
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SetFanSpeed( $desired_fan_speed_sys );
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}
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print "Setting Fan mode to FULL SPEED.\n";
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# Ensure Fan Mode is set to Full Speed
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`ipmitool raw 0x30 0x45 0x01 0x01`;
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while( 1 ) {
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#print "Calling UpdateFanSpeed()...\n";
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UpdateFanSpeed();
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#print "Update Complete - going to sleep for $seconds_to_sleep seconds...\n";
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sleep $seconds_to_sleep;
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}
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@ -0,0 +1,9 @@
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[Unit]
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Description=IPMI Fan control
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[Service]
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Type=simple
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ExecStart=/bin/perl /opt/fancontrol.pl
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[Install]
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WantedBy=network-online.target
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