OMV on Thecus N5550 NAS

  • So I just installed OMV on my Thecus N5550 NAS, using 2 USB sticks. One for installation media and the other for the OMV OS install.

    I'm surprised to see how easy the process went from downloading the ISO to a fully functioning OMV setup on my NAS :) If anyone needs a hand in doing the same, let me know, but I'm sure most can figure out the basics:

    1. Build the installation media USB stick from the downloaded ISO, with Balena Etcher.

    2. Power down your N5550 through the web interface or by pressing the power button once. This will trigger the shutdown procedure.

    3. Insert the installation media USB stick in a USB port on the back.

    4. Insert the USB stick you want to install OMV on in the front. It's easy to use this port as you can't boot from it, so no USB boot priority issues.

    5. Connect a monitor to HDMI and a keyboard to USB on the back.

    6. Power up your N5550 and press F2 as soon as you see the prompt.

    7. Set the installation media USB stick as first boot device in the BIOS. Press F10 to save and exit.

    8. Restart the N5550. It will boot from USB if all is well.

    9. Install OMV normally, see docs for details.

    For me after install it didn't show the correct network interface configuration, so I had to look up the IP that was configured through DHCP. I did this by logging in as root with the password I configured during installation, then ran 'apt install net-tools' after which I could use the trusty ifconfig to see my nic config. Go there in your browser and finish setup.

    As of now I only have some minor things to fix, maybe others have some tips how to fix these:

    1. HDD leds don't work anymore. Raid access doesn't blink any of the leds that are present in each bay. These worked fine under the old 'ThecusOS'.

    2. The system fan is spinning a bit too loud for my taste. Under ThecusOS this speed was dynamic, based on system temperature, and it would by default spin very slow after boot-up.

    3. After installation 3 separate RAID volumes / filesystems were detected, md0(ext4, 11TB) with all my files, md10(swap) and md50(xfs,500MB). I think this last one is a special journal volume, but am not sure what to do with it. Do I need to integrate this back into the RAID configuration somehow?

  • Figured out the fan control part. To be able to control the fan speed you need to:

    1. Install the lm_sensors package and it's dependencies with apt install lm-sensors

    2. Append /etc/modules to include the required modules ny running the following commands:

    echo "coretemp" >> /etc/modules

    echo "it87 fix_pwm_polarity=1" >> /etc/modules

    3. run /etc/init.d/kmod restart to load the modules

    4. check your sensors by running sensors

    5. run pwmconfig to configure the fan control file and define temperature thresholds. I set mine to 20 (min fan speed) and 65 (max fan speed).

    More info about how this works at:

  • Also got the md50 write-journal volume assigned again:

    Check its status with mdadm --detail /dev/md50 and add disks if required.

    Add it to the raid set with mdadm --manage /dev/md0 --readonly --add-journal /dev/md50

    After this, the raid set should show a consistency policy 'journal'

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