How is that relevant to the original Question ?
You cannot have ZFS Module working in an LXC Container, at least not in an unprivileged one. Not sure if your Remark is applicable to a privileged LXC Container or if you had a KVM Virtual Machine...
I don't think it's possible. After all the -args Parameter is there for what is NOT implemented by Proxmox VE [yet] and since it feeds directly into QEMU Command Line, I believe you must use a Full Path.
But why do you want to leave it attached...
Yeah, a very stupid one you could say :(. Weird that I didn't notice it until now o_O . Yet another Case of the Problem being between the Chair and the Screen. Sorry about that :(.
I would have guessed that since the default none Cache Options...
@fabian: spotted the Issue, almost by coincidence, while cleaning up /etc/fstab File.
There was a sync Mount Option set for the / Filesystem in /etc/fstab :rolleyes: . Not sure why I did that some Time ago ...
So essentially every single write...