Perform this procedure if your upgrade was unsuccessful and you split the mirrored boot disk to back it up during upgrade. You can revert to the backup that you created when you upgraded.
To revert the backup boot disk group after an unsuccessful upgrade
# vxdg bootdg
# /etc/vx/bin/vxrootadm -Y join original_bootdg
where the -Y option indicates a silent operation, and original_bootdg is the boot disk group that you no longer need.