Forked from perry-mitchell/dell-r720-fan-control.sh
Created
November 23, 2025 17:53
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Dell R720 quiet fan control
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| #!/bin/bash | |
| IDRAC_IP="192.168.0.101" | |
| IDRAC_USER="root" | |
| IDRAC_PASS=$1 | |
| if [ -z $IDRAC_PASS ]; then | |
| IDRAC_PASS=$IDRAC_PASSWORD | |
| fi | |
| FANS_1="0x0A" # 10% | |
| FANS_2="0x0F" # 15% | |
| FANS_3="0x14" # 20% | |
| FANS_4="0x19" # 25% | |
| # FANS_5="0x23" # 35% | |
| restore_dynamic_control() { | |
| echo "Restoring dynamic fan control" | |
| ipmitool -I lanplus -H $IDRAC_IP -U $IDRAC_USER -P $IDRAC_PASS raw 0x30 0x30 0x01 0x01 | |
| } | |
| set_speed() { | |
| if [ -z $1 ]; then | |
| echo "No speed set" | |
| exit 2 | |
| fi | |
| echo "Set speed: $1" | |
| ipmitool -I lanplus -H $IDRAC_IP -U $IDRAC_USER -P $IDRAC_PASS raw 0x30 0x30 0x02 0xff $1 | |
| } | |
| on_error() { | |
| restore_dynamic_control | |
| } | |
| trap "on_error" ERR | |
| TEMP=$(ipmitool -I lanplus -H $IDRAC_IP -U $IDRAC_USER -P $IDRAC_PASS sdr type temperature | egrep "^Temp" | cut -d"|" -f5 | cut -d" " -f2 | sort -n -r | head -1) | |
| echo "Highest Temp: $TEMP C" | |
| case $TEMP in | |
| [0-9]) | |
| set_speed $FANS_1 | |
| ;; | |
| [1-2][0-9]) | |
| set_speed $FANS_1 | |
| ;; | |
| 3[0-9]) | |
| set_speed $FANS_1 | |
| ;; | |
| 4[0-5]) | |
| set_speed $FANS_2 | |
| ;; | |
| 4[6-9]) | |
| set_speed $FANS_3 | |
| ;; | |
| 5[0-4]) | |
| set_speed $FANS_4 | |
| ;; | |
| *) | |
| restore_dynamic_control | |
| ;; | |
| esac |
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