So you have one static volume on a RAID made up of 4 drives, is that correct?
If that's the case I don't know how you could end up with no system volume. It's not possible to add or remove volumes with a static volume setup. There is only one volume, the static volume - it should be, and remain the system volume.
Can you post screenshots of your setup so we can see a little bit better?
- one screenshot of Storage & Snapshots > Storage/Snapshots
- one screenshot of App Center > Volume Info (button is on the left of the top bar, next to view & sort icons)
atelier522 wrote: ↑Wed May 19, 2021 5:23 pm
Is it possible to create a volume - without deleting the existing one first?
Not with a static volume.
would it be possible to reset all settings and leave the content on that existing (non-system) volume intact?
Yes but I don't know if a lossless reset would fix this issue.
QNAP tech support can probably reinstate the system volume status (or give you instructions to do it yourself) that was somehow lost assuming it's a simple configuration setting somewhere.