ASRockRack E3C246D4U2-2T IPMI temperature control

Sets fan speeds via remote IPMI according to a fan curve configured via a yaml file based on disk temperatures. If any of the disks exceeds a temperature from the configuration file the fan speeds will be set accordingly for FRNT_FAN2 and FRNT_FAN3. All other fans will be set to 100%.

Currently only works for an ASRockRack E3C246D4U2-2T since the IPMI commands used are raw commands that presumably only work for this board. Heavily inspired by coledeck. Thanks for your help :)

Usage

In case you want this installed on a True-NAS system (which doesn't let you install anything on the OS itself) you need to create a venv using python. True-NAS should've python installed by default:

python -m venv .venv
source .venv/bin/activate
pip install .

This creates a python script in .venv/bin/ipmi-temperature-control which can be used with a systemd service file

Documentation

Exit status

Exit status values are bitmasks and described here: https://linux.die.net/man/8/smartctl

E3C246D4U2-2T ipmitool raw commands

To read fan speeds:

ipmitool raw 0x3a 0x02

or more visually appealing:

ipmitool senors | grep -i fan

To set fan speeds is a bit more tricky. The format is as follows:

Reading the fan speeds give you:

ipmitool raw 0x3a 0x02
64 64 64 64 64 64 64 64

which returns 8 values (in this case all 64er meaning 100%). Each of those represent a fan header on the motherboard in the following order:

CPU_FAN1 ? ? REAR_FAN2 FRNT_FAN1 FRNT_FAN2 FRNT_FAN3 ?

Example systemd unit file

Place in a /etc/systemd/system/ipmi-temperature-control.service file, reload the daemon systemctl daemon-reload and enable the service via systemctl enable ipmi-temperature-control.service.

[Unit]
Description=IPMI temperature control

[Service]
Type=simple
WorkingDirectory=/root/ipmi-temperature-control
ExecStart=/root/ipmi-temperature-control/.venv/bin/ipmi-temperature-control \
    --config-file <path-to-config-file> \
    --ipmi-host <ipmi-host> \
    --ipmi-username <ipmi-user> \
    --ipmi-password "<ipmi-password>" \
    --log-file /var/log/ipmi-temperature-control.log

[Install]
WantedBy=default.target