There may be other volumes on the root disk, such as volumes for /home or /tmp file systems. If necessary, these can be mirrored separately using the vxassist utility. For example, if you have a /home file system on a volume homevol, you can mirror it to alternate_disk using the command:
# vxassist mirror homevol alternate_disk
If you do not have space for a copy of some of these file systems on your alternate boot disk, you can mirror them to other disks. You can also span or stripe these other volumes across other disks attached to your system.
# vxprint -t -v -e'aslist.aslist.sd_disk="boot_disk"'