idrac fan control

fan.sh

#!/bin/bash

## T620 Fan Script Inspired by https://github.com/NoLooseEnds/Scripts/tree/master/R710-IPMI-TEMP

## Require user (non-sudo) access to ipmitool (essentially /dev/ipmi0)
## Possible solution: chown :sudo `which ipmitool`; chmod u+s `which ipmitool`
## To disable dynamic fan control: ipmitool -I lanplus -H $IDRACIP -U $IDRACUSER -P $IDRACPASSWORD raw 0x30 0x30 0x01 0x00

IDRACIP="192.168.1.xxx"
IDRACUSER="root"
IDRACPASSWORD="your_awesome_password"

get_speed() {
    awk 'BEGIN{cur = ARGV[1]; ARGC = 1}
    $1 > cur{
        printf "%d", int(rpm + ($2 - rpm) / ($1 - temp) * (cur - temp))
        exit
    }
    {temp = $1; rpm = $2}
' $1 << EOF
40 10
45 20
50 40
60 60
80 80
90 100
10000 100
EOF
}

adjust_speed() {
    ipmitool -I lanplus -H $IDRACIP -U $IDRACUSER -P $IDRACPASSWORD raw 0x30 0x30 0x02 0xff $(printf "0x%02x" $1) &>/dev/null
}


# Enable manual fan speed
ipmitool -I lanplus -H $IDRACIP -U $IDRACUSER -P $IDRACPASSWORD raw 0x30 0x30 0x01 0x00 &>/dev/null

speed=0
while true; do
    sleep 5
    maxtmp=$(ipmitool -I lanplus -H $IDRACIP -U $IDRACUSER -P $IDRACPASSWORD sdr type temperature 2>&1 | cut -d'|' -f5  | awk '{if(m<$1) m=$1} END{if(m){print m}else{print "ERROR"}}')
    if [ $maxtmp == "ERROR" ]; then
        #echo "[$(date "+%F %T")] Warning: ipmi read error!!!" >&2
        logger -t fan.sh --id=$$ "Warning: IPMI read error! Try spin fan to 100%!"
        adjust_speed 75
    else
        new_speed=$(get_speed $maxtmp)
        echo $(date +'%Y/%m/%d %H:%M:%S') : $maxtmp C, set fan speed to $new_speed
        if [ "$new_speed" -eq "$speed" ]; then
            continue
        fi
        speed=$new_speed
        #echo "[$(date "+%F %T")] Temp=$maxtmp Speed=$speed%"
        logger -t fan.sh --id=$$ "Temp=$maxtmp Speed=$speed%"
        adjust_speed $speed
    fi
done