SAS HBA cards require good cooling
Do you have access to a Linux box (Ubuntu or CentOS) to install ipmitool? It can be a VM also, as long as it can access the iDRAC IP over the network.
If so, see if you can read metrics from your iDRAC with this command:
ipmitool -I lanplus -H ip.of.your.idrac -U username -P password sdr
If that works, you may be able to enable manual fan control and then set the RPM.
If so, try this:
enable manual fan control:
ipmitool -I lanplus -H ip.of.your.idrac -U username -P password raw 0x30 0x30 0x01 0x00
set fan speed to 15%:
ipmitool -I lanplus -H ip.of.your.idrac -U username -P password raw 0x30 0x30 0x02 0xff 0x0F
If needed, you can re-enable automatic fan control with the following command:
ipmitool -I lanplus -H ip.of.your.idrac -U username -P password raw 0x30 0x30 0x01 0x01
You can set the fan speed by changing the last hex value. Just input a decimal value at this site which will spit back the value in hex. So 20% would be 0x14, 30% would be 0x1E, and so on.
# /etc/systemd/system/fan.service
# to make sure that this service autostarts run this command
# systemctl enable fan.service
[Unit]
Description=Force R710 fans to high speed
[Service]
Type=oneshot
# Disable automatic fan controll
ExecStart=/usr/bin/ipmitool raw 0x30 0x30 0x01 0x00
# Force fan speed to 75% (0x4B)
ExecStart=/usr/bin/ipmitool raw 0x30 0x30 0x02 0xff 0x4B
[Install]
WantedBy=multi-user.target