I remember reading somewhere that if you fill more than 95% of the drive, it will result in performance issues in unraid. This is particularly convenient for those who add a cache disk later, or change their mind about whether an existing share should be on the cache disk. The reason that Prefer is suggested is that this provides an automated way to get files for such a share that are currently on an array disk moved to the cache disk. Prefer will act the same as Only once all the files for the share are on the cache disk. There is no need for the my drives to be spinning unless I am watching a movie. Why prefer and not only? I would like to move my appdata folder to the cache drive permanently. Set appdata user share to Use cache disk: Prefer and run mover. Would it benefit me to move the appdata folder to the cache drive? How would I go abiut doing that? I have a PlexMediaServer installed in my app data folder. I see, I thought a cache drive is not permanent storage though? I have a small SSD that I could use as a cache drive. Typically these would be on your cache drive, which is hopefully a good bit larger than you'll need for these shares. The appdata shares with 0 min free basically say "as long as there's space available, use the drive" => they would fail if there wasn't space but hopefully you're using a large enough drive that you're not going to have a space issue. This doesn't need to be "twice the size" of the largest file you're going to ever write - that's just protection against expanding requirements. The minimum free space simply says "don't start a copy unless the target disk has at least this much space". So if your current allocation method and/or split level results in a specific disk being used for a new file, if there's not enough room for that file the copy will fail. Basically the issue is simple: UnRAID will NOT span a file across multiple disks 'nor does it "know" the size of a file you're writing to it until after the write starts.
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