Claude
b3aaf999d5
Replace all prose mentions of 'Quadro P2200' with generic GPU language. Sample command output blocks left as-is (they're illustrative, not prescriptive). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
124 lines
3.3 KiB
Bash
Executable File
124 lines
3.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Dell R730xd fan speed control for third-party PCIe cards (non-Dell GPUs)
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#
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# iDRAC detects non-Dell GPUs and slams fans to 100% indefinitely.
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# This script disables iDRAC automatic fan control and manages speed based
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# on inlet temperature, keeping the server quiet under normal load.
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#
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# Install:
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# apt install ipmitool
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# cp fan-control.sh /usr/local/sbin/fan-control.sh
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# chmod +x /usr/local/sbin/fan-control.sh
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# cp fan-control.service /etc/systemd/system/
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# systemctl daemon-reload && systemctl enable --now fan-control.service
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#
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# Manual speed test (without running as daemon):
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# fan-control.sh --set 25 # set fans to 25% and exit
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# fan-control.sh --auto # restore iDRAC automatic control and exit
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set -euo pipefail
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IPMI="ipmitool raw 0x30 0x30"
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# Fan speed thresholds by inlet temperature (°C → % speed)
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# Tune these for your environment. Inlet temp sensor reads ambient air entering front.
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declare -A SPEED_MAP=(
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[0]=15 # < 30°C → 15% (near-silent)
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[30]=20 # 30–39°C → 20%
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[40]=30 # 40–44°C → 30%
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[45]=40 # 45–49°C → 40%
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[50]=55 # 50–54°C → 55%
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[55]=75 # 55–59°C → 75%
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[60]=100 # ≥ 60°C → 100% (safety)
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)
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# Minimum speed floor — never go below this (protects drives and CPUs)
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MIN_SPEED=15
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get_inlet_temp() {
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ipmitool sdr type Temperature 2>/dev/null \
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| grep -i "Inlet Temp\|Ambient\|Inlet" \
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| grep -oP '\d+(?= degrees)' \
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| head -1 || echo "35" # safe default if sensor read fails
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}
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pct_to_hex() {
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printf '0x%02x' "$(( $1 < 100 ? $1 : 100 ))"
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}
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set_fan_speed() {
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local pct=$1
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[[ $pct -lt $MIN_SPEED ]] && pct=$MIN_SPEED
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local hex
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hex=$(pct_to_hex "$pct")
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$IPMI 0x02 0xff "$hex"
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}
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disable_auto_fan() {
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$IPMI 0x01 0x00
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echo "$(date): iDRAC automatic fan control DISABLED"
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}
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enable_auto_fan() {
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$IPMI 0x01 0x01
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echo "$(date): iDRAC automatic fan control RE-ENABLED"
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}
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speed_for_temp() {
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local temp=$1
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local speed=$MIN_SPEED
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for threshold in $(echo "${!SPEED_MAP[@]}" | tr ' ' '\n' | sort -n); do
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[[ $temp -ge $threshold ]] && speed=${SPEED_MAP[$threshold]}
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done
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echo "$speed"
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}
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# ── Argument handling ─────────────────────────────────────────────────────────
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case "${1:-}" in
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--auto)
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enable_auto_fan
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exit 0
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;;
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--set)
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pct="${2:?Usage: fan-control.sh --set <0-100>}"
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disable_auto_fan
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set_fan_speed "$pct"
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echo "$(date): Fans set to ${pct}%"
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exit 0
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;;
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--temp)
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echo "Inlet temp: $(get_inlet_temp)°C"
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exit 0
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;;
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"")
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# Daemon mode — fall through to loop
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;;
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*)
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echo "Usage: $0 [--auto | --set <pct> | --temp]"
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exit 1
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;;
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esac
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# ── Daemon loop ───────────────────────────────────────────────────────────────
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trap 'enable_auto_fan; exit 0' SIGTERM SIGINT
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echo "$(date): Fan control daemon starting"
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disable_auto_fan
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last_speed=-1
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while true; do
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temp=$(get_inlet_temp)
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target=$(speed_for_temp "$temp")
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if [[ $target -ne $last_speed ]]; then
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set_fan_speed "$target"
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echo "$(date): Inlet ${temp}°C → fans ${target}%"
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last_speed=$target
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fi
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sleep 30
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done
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