The '*Arrs stack is loosely a suite of web-based tools devoted to find, download and organize your media collections. The classic 'Arrs are:

• Radarr: manage movies collection
• Sonarr: manage TV shows collections
• Lidarr: manage music collections
• Readarr: manage books and/or audiobooks collections
• Prowlarr: centralize trackers & usenet indexers for the other '*Arrs
• Whisparr: manage porn collections

They share a common landing page at The Servarr Wiki.

Loosely speaking, a few more tools can be associated to the '*Arrs stack even if they are definitely not part of the Servarr Wiki, which are:

• Bazarr: manage subtitles (cc) for movies and TV shows
• LazyLibrarian: another books and audiobooks manager/organizer
• Audio Book Shelf: the best audiobook and podcast manager and streamer app available. It's not capable to find&download audiobooks like Readarr, but it can do it for podcasts.

One last interesting resource for managing the '*Arrs stack is the Trash Guides which is a pretty ocmprehensive collection of hints, settings and general configuration for the '*Arrs.

If you remember from Storage Setup, you have mounted your /data RAID disks. It seems like a good idea to store your media collection on it, doesn't it?

I like to create the following folders:

• /data/Media/Movies (owned by radarr user)
• /data/Media/Tv (owned by sonarr user)
• /data/Media/Music (owned by radarr user)
• /data/Media/Podcasts (owned by audiobookshelf user)
• /data/Media/Books (owned by readarr user)
• /data/Media/Audiobooks (owned by audiobookshelf user)

It is a good idea to create a common group called media to which all the services that find, download, organize and play your media collections will belong. This will highly simplify file access and help reduce permission issues. The above folder structure shall be owned by this group:

So, here how you can create this structure and apply the permissions (this assumes you have already installed the various services):

mkdir /data
mkdir /data/Media
cd /data/Media 
for i in Tv Music Movies Books Audiobooks Podcasts; do mkdir $i; done
chown radarr:media Movies
chown sonarr:media Tv
chown readarr:media Books
chown audiobookshelf:media Audiobooks Podcasts
chown lidarr:media Music