I recently got upset about qnap QTS (I have a qnap ts-453D) for being pretty closed, and not letting me do what i want, so i tried installing TrueNAS Core.
The installation was good until i rebooted, after removing the usb stick and starting the nas again, no boot option was available except the default qnap OS and the built-in UEFI shell.
btw I tried installing in UEFI and in BIOS but I get the same results.
I don’t know the specifics of your qnap device or if it allows for installation of other OS. Can you select the boot medium in BIOS (if you can access it) / on which drive did you install truenas?
I think you have to remove the build in sata dom where QOS is installed on. Otherwise the qnap will always try to boot from sata dom. If you have access to the bios you can try to changeg the boot order from satadom to ssd/whatever you intsalled truenas to.
I think Lars is right, that’s why I asked where you tried to install. I can image these systems to be pretty strict regarding what you can or cannot change.
Actually i did it one time, and realized just after that i couldn’t access my data because QNAP uses a different filesystem, so I reinstalled QTS, but since I backed up everything I want to reinstall truenas but I can’t figure out what am I doing wrong.
So it works, I just don’t know what is different
No secure boot option in the bios, and it’s written WD5000alzx but it looks like an aaks. Anyway i tried on an ironwolf of 10TB and one of 20TB and the issue is the same so I don’t thune it’s the hard drive.