From 565d78b7452b4a13eeb5a8c0d65054dcdc9b1819 Mon Sep 17 00:00:00 2001
From: zeus <kai@kostianix.de>
Date: Sat, 23 Nov 2024 19:50:12 +0100
Subject: [PATCH] new script: supermicro-ipmi-fancontrol

---
 almost_oneliners/ipmi-limit-fans.sh | 56 +++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 almost_oneliners/ipmi-limit-fans.sh

diff --git a/almost_oneliners/ipmi-limit-fans.sh b/almost_oneliners/ipmi-limit-fans.sh
new file mode 100644
index 0000000..457dc13
--- /dev/null
+++ b/almost_oneliners/ipmi-limit-fans.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# This script limits the threshholds of the superloud supermicro fans to more 
+# manageable values, if used as is (instead of swapping fans for e.g. noctua fans).
+# Put this in e.G. /etc/init.d/ , because values are reverted on powerloss.
+
+# set limits in 64 steps from 00-FF (convert to hex!):
+# 0x00 ==   0% / minimal
+# ...
+# 0x16 ==  25%
+# 0x24 ==  37.5%
+# 0x32 ==  50%
+# ... 
+# 0x64 == 100% / fullspeed
+
+LIMIT="0x16"
+
+# number of fans installable on given mainboard (check with e.G. `ipmitool sdr | grep -i rpm`)
+FANCOUNT="8"
+
+# fan critical limits
+
+LNR="300" # Lower Non-Recoverable
+LC="500"  # Lower Critical
+LNC="700" # Lower Non-Critical
+
+UNC="10000" # Upper Non-Critical
+UC="10500"  # Upper Critical
+UNR="11000" # Upper Non-Recoverable
+
+# check availability of ipmitool
+if
+        which ipmitool >/dev/null
+then 
+        echo "ipmitool available. Continue."
+else
+        echo "ipmitool not installed. Aborting."
+        exit 1
+fi
+
+# limit upper and lower values for fans 1-8 to non-unrealistic values
+for fan in $(seq 1 $FANCOUNT); do
+    /usr/bin/ipmitool sensor thresh FAN$fan upper $UNC $UC $UNR
+    /usr/bin/ipmitool sensor thresh FAN$fan lower $LNR $LC $LNC    
+done
+
+echo "set fan mode to full (needed for static control) and let things settle"
+/usr/bin/ipmitool raw 0x30 0x45 0x01 0x01; sleep 10
+
+echo "set fans in "system" zone to 25% and let things settle"
+/usr/bin/ipmitool raw 0x30 0x70 0x66 0x01 0x00 $LIMIT; sleep 5
+
+echo "set fans in "peripheral" zone to 25% and let things settle"
+/usr/bin/ipmitool raw 0x30 0x70 0x66 0x01 0x01 $LIMIT; sleep 5
+
+echo "all done"