@1fallen - thx ;o)
I will be doing a bit more zfs testing (adding nvme SLOG & special device to the SSD pool + SATA stripe testing) - from what my testing has shown so far - I won’t lose much performance going from pci-passthrough => zvol with proper disk / blocksize alignment.
I was actually thinking about a full zfs system after reading a post here. zfs never leaves you with an unfixable full filesystem (btrfs has several times when used outside of root for data - it does not reserve enough free space)