Hello,
I also create a working Xpenology DSM 6 with actual Pat File on an normal Intel machine.
Same procedure - after reboot - the volume crashed and I fix this with the task manager, running a task as root with "mount /dev/mapper-vg1 /volume1" and the crashed volume will become GOOD.
But all the "Shared Folders" are not present - via SSH I can see all the "subvolumes" and all the files in it.
At the moment, when I reboot the machine, I create the shared folders (same name and para) via the WEB ui again and all my files become present.
Is is possible to mount also the subvolumes as "Shared Folders" with a mount or btrfs command?