Using slices to create minimal rootdg

veritas already installed

vxdctl add disk c0t0d0s4 type=simple
vxdisk -f init c0t0d0s4 type=simple
vxdg adddisk disk01=c0t0d0s4

You can now remove/move the remain disks from rootdg


veritas installed but not setup vxconfigd –d ( if already started use vxconfig –m disabled)
vxdctl init
vxdg init rootdg
vxdctl add disk c0t0d0s4 type=simple (ignore any error messages)
vxdisk -f init c0t0d0s4 type=simple
vxdg adddisk disk01=c0t0d0s4
vxdctl enable  
rm /etc/vx/reconfig.d/state.d/install-db