Tin meant that the names for each device shoudl be different. Also, there does seem to be an issue with two SMPs or HUBs accesing the same NAS. You may want to read these two articles written by TonyPh12345.
WARNING: If you have two or more HUBS or Live-SMP’s …
Two or more Hubs or SMPs will cause Media Library Corruption on NAS shares.
Note that I do not use a NAS so have not encountered these issues. I just recalled reading Tony’s posts so am adding the links here for you.
Good luck
-P
