To mirror an existing root volume:

 1. pvcreate -B /dev/rdsk/device (-B creates BDRA area)
 2. vgextend /dev/vg00 /dev/dsk/device
 3. mkboot /dev/rdsk/device (put boot utilities into boot area)
 4. mkboot -a "hpux boot arguements here" /dev/rdsk/device
 5. lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/device
 6. lvextend -m 1 /dev/vg00/swaplv /dev/dsk//device
 7. repeat lvextendin sequence for all root logical volumes
 8. lvlnboot -v( to update the boot information with the new disk)