Another setup to try. I have a bunch of various size disk that I do not know what’s the best setup for.
mergerfs combines different disk with different filesystem and show it as a single mount. Files are still flat. Disks can still be mounted individually.
SnapRAID can be used to setup a parity drive to allow recovery if one drive fails.
The idea is to combine the two technology. Mergerfs to combine disks + SnapRAID for data redundancy.
Something to checkout.