Reading this forum, i found this link :
https://manual.calibre-ebook.com/faq...rked-drive-nas
So I Guess I poked the devil doing what I did.
I'm pretty sure I cannot embrace all the file system action handeled by Calibre.
However, except that case sensitivity, and the simultaneous edition risk, is there any other issue hosting it directly on a NAS ?
Usecase today are more and more detached from a single computer.
i've got many at home, between works computer, personal, wife, tablettes 'n phones....
And it's a bit difficult to say I have to use this specific computer to edit my db.