The DNS-320L automatically treats the P2P folder as a separate logical volume, and this unfortunately cannot be changed. The consequences of this structure results in the requirement to actually copy files from P2P to Volume_1 although both volumes reside on the same physical HDD.
its not done at a single folder level, you cant create any folder called "p2p" anywere by smb share, even if its deeply nested behind some other folder, if you try it will fail.
you can create a p2p folder by ftp but it will be invisible when accessing from smb shares.
this is really annoying as you cant just replicate a disk that contain a p2p folder with other files inside it.