Here are some tips and tricks about running Debian on the QNAP TS-409.
Automatic fan control
Debian ships a program called
qcontrol which can be used to control the
fan, LEDs and buttons on QNAP devices. You can edit the
/etc/qcontrol.conf configuration file to change the behaviour of
qcontrol, for example how the fans are regulated depending on the
temperature or which commands to run when a button is pressed.
Automatic power on
QNAP machines can turn on automatically when power is applied if the device was not powered down correctly. This is helpful when your power goes down. In order to enable this feature, run the following command:
sudo qcontrol --direct autopower on