hi all . i found a very nice page ( http://fuguita.org/index.php?BBS%2F3 ) .
so i follow it , then i manage to clone HDD1 to HDD2 ( fdisk , disklabel & growfs ) 1) HDD1 < HDD2 2) dd HDD1 to HDD2 (by archlinux) 3) power on HDD2 boot bsd.rd fdisk -e sd0 -> edit 3 disklabel -E sd0 -> b -> c a fsck -fy /dev/rsd0a growfs /dev/rsd0a /dev/rsd0a reboot detail is on http://openbsd-akita.blogspot.jp/2018/04/growfs.html but there may be some mistake , please point out them . ----------- regards