[rleigh]

I don't think it's your fault in any way.

We expect filesystems to work robustly. We do not expect them to fail after an arbitrary time interval merely by being used. Even terrible filesystems like FAT don't do that. They might get fragmented and slow, but they don't just stop. I find it incredible that this is often minimised by people; it's a complete show-stopper irrespective of the other problems Btrfs has.

I made exactly the same migration you did. ZFS has been solid, and it does exactly what it says on the tin.