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ergosteurandClaude Opus 5
00384e7463
Manual fan mode pins the fans at a fixed duty and never ramps, so a sustained load had no cooling response until the BMC's own critical-temperature override stepped in. docker-idrac.sh solved that, but needs Docker, which is not installed on the host. ipmi-fancontrol-daemon polls the CPU sensors and switches between the fixed duty and the BMC's automatic curve around a threshold, which is what that container did. Measured on the host: 1440 RPM pinned versus roughly 4200 RPM on the automatic curve at the same 60C. - Hysteresis, default 5C, stops the fans oscillating at the boundary. - An unreadable temperature fails safe to automatic rather than staying pinned. - SIGTERM restores the automatic curve, with ExecStopPost as the backstop for an outright kill. Default to the local "open" interface. It needs no credentials and no network, which matters for the shutdown path, where lanplus to the iDRAC could fail once networking is down. ipmi-fancontrol-auto and -manual honour the same setting and stay available for ad-hoc use. Enable the third-party PCIe cooling response suppression that docker-idrac.sh was configured with, so the automatic curve is not held to a raised floor by the aftermarket NICs. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
40 lines
1.1 KiB
Bash
Executable File
40 lines
1.1 KiB
Bash
Executable File
#!/bin/sh
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# Hand fan control back to the BMC's automatic curve.
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#
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# Used ad-hoc, and as the ExecStopPost backstop for ipmi-fancontrol.service.
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set -eu
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SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
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CONFIG=${IPMI_FANCONTROL_CONFIG:-$SCRIPT_DIR/conf/ipmi-fancontrol.conf}
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if [ ! -r "$CONFIG" ]; then
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echo "Error: cannot read $CONFIG" >&2
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echo "Copy conf/ipmi-fancontrol.conf.example there and fill it in." >&2
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exit 1
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fi
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. "$CONFIG"
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: "${IPMI_INTERFACE:=open}"
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# The local "open" interface needs no credentials and no network, which matters
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# here: this runs at shutdown, when networking may already be gone.
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ipmi() {
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if [ "$IPMI_INTERFACE" = "lanplus" ]; then
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ipmitool -I lanplus -H "$IPMI_HOST" -U "$IPMI_USER" -E "$@"
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else
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ipmitool -I open "$@"
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fi
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}
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if [ "$IPMI_INTERFACE" = "lanplus" ]; then
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: "${IPMI_HOST:?not set in $CONFIG}"
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: "${IPMI_USER:?not set in $CONFIG}"
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: "${IPMI_PASSWORD:?not set in $CONFIG}"
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# ipmitool -E reads the password from the environment, keeping it out of argv.
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export IPMI_PASSWORD
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fi
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# Re-enable automatic fan control.
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ipmi raw 0x30 0x30 0x01 0x01
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