I recently moved my iTunes library to my Netgear ReadyNAS NV+ (all relevant file operations on the NAS are using AFP protocol). The library had previously been on my Mac Pro, in my
~/Music directory. In iTunes Preferences > Advanced, I changed the path of the iTunes Media Folder to the Media volume on the NAS, so that it now has the path
/Volumes/media/Music/iTunes Media. In iTunes, I chose File > Library > Organize Library, then chose Consolidate Files from the Organize Library dialog. This made iTunes copy all of the files from the Mac Pro's iTunes Media Folder to the iTunes Media Folder on the NAS. After that, I deleted the 60 GB of files in the Mac Pro's local iTunes Media Folder (the boot drive is an SSD, so I needed the space).
On the Mac Pro, the setting for the location of the iTunes Media Folder has changed back from the NAS to the local folder twice now; I've had to reset it back to the NAS. Some apps have been updated, and I discovered that the updates had been downloaded to the local iTunes Media Folder. After I reset that location to the NAS and re-ran Consolidate Files, the apps were copied to the NAS. Any idea what's causing iTunes to "forget" the NAS location and revert to the local folder, and how to solve that problem?
After I moved the library on the Mac Pro to the NAS, I also pointed the copy of iTunes running on my MacBook to the NAS, so that it could share the files (I can still share the files using Home Sharing from the Mac Pro, of course). It appears that the MacBook doesn't seem to simply read the state of the library from the NAS; it erroneously shows that 84 mobile apps need updating, and some TV shows that I downloaded on the Mac Pro don't appear on the MacBook. I'm OK with simply using Home Sharing on the MacBook if necessary, but I was hoping the two machines could share the same library on the NAS and would stay in sync. Can you explain the MacBook behavior? Is there a fix that would keep the iTunes libraries on the two machines in sync?