Another one to look at is snapraid [1]. Open source, also supports mix of disk sizes, adding/removing, and drives are usable alone. Negatives are it does schedu

Another one to look at is snapraid [1]. Open source, also supports mix of disk sizes, adding/removing, and drives are usable alone. Negatives are it does scheduled (not real-time) parity, and you have to run mergerfs yourself on top of you want a consistent view. I've been using it for a few years, and it's survived one drive failure (which I replaced with a disk twice the size). I originally had it on a Ubuntu server but have since migrated to running in openmediavault (which does all the setup for you), on a vm within proxmox server. [1] https://www.snapraid.it/ https://www.snapraid.it/