Ok, I reversed the change I did and my dockers and VMs are back. So, that's good.
Currently, most of my docker containers are on an UD. This is the disk that I wanted to change to pool. I just assigned it, so thought this was all what was needed.
How do you suggest to set the location of docker vidsk and libvirt? /mnt/user/sytem?
What is cache-prefer and how to set it?
Do I have to reinstall all docker containers or can I move it? I am worried to lose data.