This task could have a negative impact on the performance. Perform this task only on a lightly loaded system or during scheduled maintenance.

  provides a controlled upgrade of the inactive partition. Unlike the One-Step Upgrade, the controlled upgrade does not automatically reboot the after the upgrade procedure has finished. In order to boot from the newly upgraded partition, you must set it as the active partition which will prompt you to authorize the  reboot. This option may be convenient if you wish to upgrade the partition during active call services, and only activating it during a scheduled service downtime.