mdconfig -s 490350672
gpart create -s MBR /dev/md0
gpart add -t freebsd md0
gpart create -s BSD md0s1
gpart add -t freebsd-ufs md0s1
newfs /dev/md0s1a
mdconfig -s 490350672
sysctl  kern.geom.part.check_integrity=0
gmirror label -b prefer -n gm1 /dev/md1 /dev/md0
dmesg -a | fgrep GEOM_PART