I have searched google quite a bit but still couldn't find any conceptual overview of how unionFS works with SnapRaid.
Coming from NAS4Free / XigmaNAS and ZFS backgorund I think I miss the essence of how snapraid works. I was wondering if there was a good source of the basics you could point me to.
I simply cannot grasp how you would unionFS something with individual filesystems on individual disks and THEN 'raid' them together...
Many thanks in advance.