Force a failover from your primary node to the backup node by choosing Administration > Cluster Configuration. In the Configuration tab, click Switch Primary and Backup. See Switch the Primary and Secondary Node Status for details.
Your backup node becomes Primary. Your former primary node goes into Waiting status.
In your new primary node, shutdown the CC-SG application by choosing System Maintenance > Shutdown.
When you shutdown the CC-SG application, the unit is still powered on, and accessible through the Diagnostic Console. See CC-SG Shutdown for details.
If the primary node upgrade succeeds, perform a factory reset of the backup node by accessing the Diagnostic Console and choosing Operation > Admin > Factory Reset > Full CC-SG Database Reset option. See Reset CC-SG Factory Configuration.