An answer that comes waaay to late, but here goes. There is a tut on youtube on how to install Calibre in OMV via Docker:
https://dbtechreviews.com/2020/05/ho...mv-and-docker/
If any of you knows a way to actually use multiple libraries on multiple harddrives with this solution, please let me know. This is where I am now: when I try to change the library by going to Calibre Library -> New Location and browse for a new location, when I click on Computer then /, I get a limited directory structure that is not related to the one that OMV is able to access. I have almost zero knowledge in linux and docker, but a friend of mine who is good in linux (but with zero experience in docker) did not figure this either. So is that what I am seeing the docker image structure of calibre? And how can I make calibre see more than that structure? For example some folders I created and shared in OMV. Thank you so much for any suggestion you might have!