I personally, use a bash script, which runs as a daemon, that dynamically sets the fan speed based on temps.
So, under idle, the servers run nearly silent. Under load, the fans can spin up.
When the script/daemon stops, it restores the default fan curve.
Where do you put the script? I just want to fix the fan speed to 10% when the server power on.
How I do it.
A bash script that runs on my Truenas Server that manages the fan speeds of my MD1200 and my server. Watches for temperatures and ramps accordingly.
As others have implied, you need to have something run on startup that will execute that IPMI tweak again.
In my case ESXi auto-starts my VMs, one of which is a docker VM and it auto starts a container that does the IPMI tweak (and monitors temps and adjusts and all that).
You don’t need to layer it this deep, but fundamentally you need things to auto-start on boot, including this.