In FreeBSD, there's a sysctl for setting minimal ashift to 12 and ignoring 9 reported by disk. I always have this one in my /etc/sysctl.conf: vfs.zfs.min_auto_

In FreeBSD, there's a sysctl for setting minimal ashift to 12 and ignoring 9 reported by disk. I always have this one in my /etc/sysctl.conf: vfs.zfs.min_auto_ashift=12 (This must be done before creating ZFS pool.)