How do I clear/flush the cache drive?
In share settings I set "Use cache (for new files/directories):" to Yes/Preferred (forgot which one, I keep changing to test them out).
I pressed mover button. It says beside Yes/Preferred "Mover transfers files from array to cache". My cache drive now has files from my array which makes sense.
How do I clear the files from the cache drive or flush the cache drive? It's currently at 100%.
There are multiple parts to that video, so it doesn't help me understand what you plan to do.
By default 2 devices are set to mirror each other, which limits the capacity to the smaller of the 2, and doesn't add any capacity, and if the added device is smaller than the original, it will reduce the capacity of the pool to match the smaller device.
That's why I asked what you planned to do.