Hi - I have a DS1621+ for about a year now, and need to expand my space so I now have a DX517 on the way. I read in some places that it’s best to use DX517 as its own separate Volume, and not to expand from Volume 1 on main unit. Is this really what most people do and recommend? I can do this, but just curious what others do and why. I mainly use the NAS as a Plex server, and wondering about pros/cons of just keeping Volume 1 (by expanding it with DX517) vs. expanding it into a Volume 2 with additional Plex libraries on it. Thanks in advance for any feedback!