Out of curiosity, why did you switch from btrfs to zfs so quickly? Did you encounter any major issues with btrfs?
- No, I didn't encounter any issue during the brief period of using root on btrfs. Originally I started with root on btrfs because it has in-kernel support and the installation is relatively simple. Just look at those workarounds to get ZFS booted with GRUB!
- But later I decided to switch to root on ZFS because it 1. is more actively developed, 2. has more features, 3. is more stable.
- Also booting an alternate root filesystem with btrfs is also more difficult, involving hacking overlayfs into initramfs.