OMV - mdadm --> Upgrade to Snapraid + AUFS (or else?) install problem

Why do I need mysql for plex?
I thought I need plex server. I see i'm way in the dark

I installed the Plex server plugin and created a nex VirtualHDD 1GB for the Database and and browsed it. Enabled the plugin and now I don't know what to do, I don't find an installation tutorial for it.
Con someone point me in the right direction ?

So I figured out that the folder setup is in the web service.
What I don't like in plex is that the library is become huge witch just 4 movie added to the watch folder.
I tryed out the transcoding feature and I think the chache of that is what is so big .
I gave a try to the mediabroser to, but I can't decide how to set it up?
Should I place the library files in a setarate folder or just in the movies directoryes?

So I think there must be some error in the measurement.
I checked it with a windows computer over the network , with a simple right click propertyes.
And the Size is 70 Mb but the Disk size is 2,6 GB.
The movies folder is 7 GB....
I think I will just keep the stuff separated.

How can I set up a libary for XBMC and can for exampla media browser use this library or can xbmc use media browser library ( I'vw red something about it.)
I guess plex is just too difrent in these things.
The best would be all the 3 use the same small separated library with more users. ( I this case 2 user)

I try to use the mysql with xbmc but when I place the advancedsettings.xml file in the kodi userdata folder ij kodi all the local libary items gone and cant get the thumbs info stb . Not even movies tab in kodi.
The film which was alredy in the files rab those are there without any metadata and can be played . But there is bo artwork stb . I think there is somewhere an authentication issue.
How can i get it work?

Ok thank's