If a drive fails, you only need the parity disk to restore, not the whole array. Also, if for some reason you can’t restore, you only lose data on the failed drive.
ZFS is great and for real NAS data, I’m a fan. But for large media files and and such that you are write once, read many, it’s a much better option I think.
Mergerfs is just to present all 20 drives as a single mount point so you aren’t searching thru 20 drives when you want to view.
Mergerfs + snapraid
If a drive fails, you only need the parity disk to restore, not the whole array. Also, if for some reason you can’t restore, you only lose data on the failed drive.
ZFS is great and for real NAS data, I’m a fan. But for large media files and and such that you are write once, read many, it’s a much better option I think.
Mergerfs is just to present all 20 drives as a single mount point so you aren’t searching thru 20 drives when you want to view.