(Create the mirror:)
# metainit -f d10 1 1 c0t0d0s0
d11: Concat/Stripe is setup
# metainit -f d20 1 1 c2t2d0s0
d12: Concat/Stripe is setup
# metainit d0 -m d10
d10: Mirror is setup
# metaroot d0
# lockfs -fa
 
(Reboot the node:)
# scswitch -S -h phys-schost-1
# shutdown -g 0 -y -i 6
 
(Attach the second submirror:)
# metattach d0 d20
d0: Submirror d20 is attached
 
(Enable the localonly property of the mirrored disk's raw disk device group:)
# scconf -c -D name=dsk/d2,localonly=true
 
(Record the alternate boot path:)
# ls -l /dev/rdsk/c2t2d0s0
lrwxrwxrwx  1 root     root          57 Apr 25 20:11 /dev/rdsk/c2t2d0s0 ->
../../devices/node@1/pci@1f,0/pci@1/scsi@3,1/disk@2,0:a,raw