Perform the Live Upgrade manually or use the installer. The nodes do not form a cluster until all of the nodes are upgraded to VCS 5.1. At the end of the Live Upgrade of the last node, all the nodes must boot from the alternate boot environment and join the cluster.
Upgrading VCS using Live Upgrade involves the following steps:
Create a new boot environment on the alternate boot disk.
See Creating a new boot environment on the alternate boot disk.
Upgrade to VCS 5.1 on the alternate boot environment manually or using the installer. Refer to one of the following:
Switch the alternate boot environment to be the new primary.