I found some information on this site, just want to cover my bases before doing it on our production system:

prtconf -vp|grep bootpath

root@discus2 # prtconf -vp|grep bootpath

bootpath: '/ssm@0,0/pci@18,700000/pci@1/SUNW,isptwo@4/sd@0,0:a'

root@discus2 # eeprom

nvramrc=devalias vx-disk01 /ssm@0,0/pci@18,700000/pci@1/SUNW,isptwo@4/sd@1,0:a #vx-disk01 is alternate boot disk

devalias vx-rootdisk /ssm@0,0/pci@18,700000/pci@1/SUNW,isptwo@4/sd@0,0:a #vx-rootdisk is primary boot disk

root@discus2 # vxprint -htg rootdg

DG NAME NCONFIG NLOG MINORS GROUP-ID

DM NAME DEVICE TYPE PRIVLEN PUBLEN STATE

RV NAME RLINK_CNT KSTATE STATE PRIMARY DATAVOLS SRL

RL NAME RVG KSTATE STATE REM_HOST REM_DG REM_RLNK

V NAME RVG KSTATE STATE LENGTH READPOL PREFPLEX UTYPE

PL NAME VOLUME KSTATE STATE LENGTH LAYOUT NCOL/WID MODE

SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE MODE

SV NAME PLEX VOLNAME NVOLLAYR LENGTH [COL/]OFF AM/NM MODE

DC NAME PARENTVOL LOGVOL

SP NAME SNAPVOL DCO

dg rootdg default default 0 1039288246.1025.discus2

dm disk01 c0t1d0s2 sliced 2888 71124291 NOHOTUSE

dm rootdisk c0t0d0s2 sliced 2888 71124291 -

v rootvol - ENABLED ACTIVE 37568556 ROUND - root

pl rootvol-01 rootvol ENABLED ACTIVE 37568556 CONCAT - RW

sd rootdisk-02 rootvol-01 rootdisk 0 37568556 0 c0t0d0 ENA

pl rootvol-02 rootvol ENABLED ACTIVE 37568556 CONCAT - RW

sd disk01-01 rootvol-02 disk01 0 37568556 0 c0t1d0 ENA

v swapvol - ENABLED ACTIVE 16776423 ROUND - swap

pl swapvol-01 swapvol ENABLED ACTIVE 16776423 CONCAT - RW

sd rootdisk-01 swapvol-01 rootdisk 37568556 16776423 0 c0t0d0 ENA

pl swapvol-02 swapvol ENABLED ACTIVE 16776423 CONCAT - RW

sd disk01-02 swapvol-02 disk01 37568556 16776423 0 c0t1d0 ENA

v var - ENABLED ACTIVE 16779312 ROUND - fsgen

pl var-01 var ENABLED ACTIVE 16779312 CONCAT - RW

sd rootdisk-03 var-01 rootdisk 54344979 16779312 0 c0t0d0 ENA

pl var-02 var ENABLED ACTIVE 16779312 CONCAT - RW

sd disk01-03 var-02 disk01 54344979 16779312 0 c0t1d0 ENA

root@discus2 #

vxplex -g rootdg dis rootvol-02

vxplex -g rootdg dis swapvol-02

vxplex -g rootdg dis var-02

vxedit -rf rm rootvol-02

vxedit -rf rm swapvol-02

vxedit -rf rm var-02

vxprint -htg rootdg (make sure the plexes were removed.)

vxdg rmdisk disk01

vxdiskunsetup -C c0t1d0

mount /dev/dsk/c0t1d0s0 /mnt

touch /mnt/etc/vx/reconfig.d/state.d/install-db

rm /mnt/etc/vx/reconfig.d/state.d/root-done

vi /etc/vfstab

Instead of:

/dev/vx/dsk/swapvol - - swap - no -

/dev/vx/dsk/rootvol /dev/vx/rdsk/rootvol / ufs 1 no logging

/dev/vx/dsk/var /dev/vx/rdsk/var /var ufs 1 no logging

Make it:

/dev/dsk/c0t0d0s1 - - swap – no –

/dev/dsk/c0t0d0s0 /dev/rdsk/c0t0d0s0 / ufs 1 no logging

/dev/dsk/c0t0d0s5 /dev/rdsk/c0t0d0s5 /var/ufs 1 no logging

# Double-check the /mnt/etc/system and comment out the rootdev entries

# if they are there

vi /mnt/etc/system

# Only comment out the following entries

rootdev:/pseudo/vxio@0:0

set vxio:vol_rootdev_is_volume=1

umount /mnt

reboot server in single user mode

apply patches

validate if everything goes smoothly, then:

vxdiskadm option 6

source disk rootdisk

target disk disk01

otherwise:

make changes in /etc/vfstab to reflect slices of vx-disk01

boot from vx-disk01(disk01)

encapsulate disk

mirror disk using vxdiskadm