It looks like that between netbsd-9 and netbsd-10 the order of ZFS mounts vs fstab has changed.
I've just upgraded a system which had ffs filesystems for / & /home, and a zfs pool on /home/files Before the upgrade the mount order was / (ffs) /home (ffs) /home/files (zfs) after upgrade the exact same configuration gives: / (ffs) /home/files (zfs) /home (ffs) resulting in /home/files being inaccessible. I'm not saying the new order is wrong, it's just likely to break any existing configuration which has a zfs mount on top of a non root filesystem in ffs... Does anyone have any thoughts on the best approach? - a note in NetBSD-10 release notes and fstab/zfs manpage? David