I run SnapRAID on top of Drivepool on a windows machine. You could use SnapRAID with something like mergerfs on Linux if you wanted. I have two pools (10 data, 3 parity) and a (3 data, 1 parity). With snapraid I run pool syncs nightly and scrub (~3% nightly to cover the entire array monthly).I tried unRAID first and liked it, but there were some issues with my LSI controller resulting in poor write speed, I was never able to figure it out. I've been running the Drivepoo/SnapRAID combination now for ~6 years or so. I've had to rebuild two drives from parity in that time and it was painless (a config file edit and two commands).