The Synology DSM has a feature for you to turn on the media folders for music, video and pictures. I choose not to use these with my Mac since it uses it's own file structure to maintain the database. If you have your files already in these folders, then you should be able to link them in iTunes, but you won't want to "Keep iTunes Folder Organized" and won't want to "Copy files to iTunes Media folder when adding to library". This DSM folder structure is really for use with DSM and not with other third party sofware. In fact if you want to use the Synology media apps for your mobile device, you don't need to organize your files with these folders either. DSM allows you to index specifc folders that have this media. You have to manually set this up in DSM, but it's rather easy to do. Here's a tutorial from Synology. Start half way down the page at "4. Configure Audio Station"
http://www.synology.com/support/tutorials_show.php?q_id=499&lang=us
I recommend you leverage Apple's organizing system for both music & videos, as well as your iPhoto database. Just be sure to add any music through your iTunes app rather than dragging and dropping to the server folder directly, so iTunes can catalog and index the media. Since my ecosystem is all Apple, I benefit from "Keep iTunes Folder Organized" and "Copy files to iTunes Media folder when adding to library" checked.
Setting up iTunes
- In the iTunes preferences set the iTunes Media folder location to the folder on your NAS that contains your media. As long as the NAS is mounted on your desktop, it will read and write to this remote location.
- If your media is in the same folder structure that iTunes organized it, then once you point to it, it should be good to go.
- If not, then delete delete all your media in iTunes, but do not delete the original files.
- Select the files in iTunes, select the Delete key. It will give you a popup window with "Do you want to delete the selected TV show, or keep it in the iTunes Media folder?"
- Select "Keep File". It deletes it from iTunes, but not off your Mac.
- From your NAS folder with the media, drag-n-drop a test file onto your iTunes window. It will move the file into an organized iTunes folder structure on the NAS. Since all your files are already on the NAS, then it doesn't have to rewrite the files, just moves them into the appropriate folder structure. If all is set correctly, then you can proceed with draging-n-dropping your entire library to iTunes. This could take a bit of time depending on the size of your library.
- The typical folder structure iTunes creates is Music\iTunes\iTunes Media\ [and then Music, Movies, TV Shows, Podcasts, etc]
If you do not have the Share mounted on your Mac desktop, iTunes will rest this location to the default location in your local Music folder in your Home folder. This becomes an issue when auto download is enabled and your NAS is not mounted. This really is no big deal, just a nuisance. Quit iTunes, Mount the Share, open iTunes and go to the preferences to confirm that the remote location is now set back to it's original setting. At least this way you don't have to reset this again, which would cause a reindex of all your files.
To make sure your NAS share is mouted before you launch iTunes, try creating a simple Automator app that mounts your NAS when you start up your computer. It should still stay mounted when the computer goes to sleep.
Since the NAS is networked, I can pull up my entire library on my Apple TV, or on any of my Apple devices. For Apple TV to work, however, the Mac with your iTunes library must be turned on and connected with your NAS. Apple TV reads from your iTunes database file to display all the content, rather than scan the entire library. This is something I wish Apple would change, but it keeps their customers locked in to their iTunes ecosystem and not something they will be giving up anytime soon.
Setting up iPhoto
I don't have my library on my NAS but here is what I found out, https://discussions.apple.com/thread/2685974
Unless the NAS is formatted Mac OS extended (journaled) you will not be able to run the iPhoto library on it
If it is then Moving the iPhoto library is safe and simple - quit iPhoto and drag the iPhoto library intact as a single entity to the external drive - depress the option key and launch iPhoto using the "select library" option to point to the new location on the external drive - fully test it and then trash the old library on the internal drive (test one more time prior to emptying the trash)
And be sure that the External drive is formatted Mac OS extended (journaled) (iPhoto does not work with drives with other formats) and that it is always available prior to launching iPhoto
And backup soon and often - having your iPhoto library on an external drive is not a backup and if you are using Time Machine you need to check and be sure that TM is backing up your external drive
LN