I would like to know this also. I have 2,000,000+ files on this unRAID server (company offsite backup). I tried upgrading to 5.0 from 4.7 and could not access any of my data folders. Some were saying I needed Login/Password (my shared folders) and some were saying they did not exist (my Disk1, Disk2, Disk3....ect). I tried running the permissions 3 times and it looks like it hangs up on my first drive and then stops. There is activity on my first drive, so I just leave it......and then a few hours later there is no activity and I can still not access the files. So I downgraded back to 4.7 again and back up and running, because I would like the >2TB support. What do you guys think is the problem? Or like ftp222 said, is there a way to "Pre-Permission" these or some other way about this?