3176 Nokia Network Voyager for IPSO 4.0 Reference GuideNoteWhen you click Test Boot, the system tests the new image for five minutes. If you let thefive-minute test period expire without committing to the new image, the systemautomatically reboots and reverts to the previous image.A new page appears, and you see a message telling you that the system will be rebooted. Donot click anything on this page.5. If you did not choose the test boot option, the upgrade is complete after the appliancereboots. You do not need to do anything else.If performed a test boot and want the system to continue using the new image, you have fiveminutes after the system restarts to select Commit Testboot. If you do not, the systemautomatically reboots the previous image in five minutes.Upgrading Nokia IPSO Images for a ClusterYou can use Cluster Voyager to upgrade the Nokia IPSO image on all the cluster nodes. Afteryou see that the new image is successfully installed on all of the nodes, you need to reboot themso that they will run the new image. For more information about Cluster Voyager, see“Managing a Cluster” on page 231 in the section on configuring traffic management.Rebooting a ClusterWhen you click Reboot, Shut Down System on the main configuration page in Cluster Voyager,you see the Cluster Traffic Safe Reboot link. If you click this link, the cluster nodes are rebootedin a staggered manner. The process is managed so that at least one node is always operational.For example, if you reboot a two-node cluster, one node restarts first. The second node waits forthe first node to restart successfully and rejoin the cluster before it reboots. If the first node doesnot successfully rejoin the cluster, the first node does not reboot.Downgrading Nokia IPSO ImagesWhen you downgrade an IPSO image, the system behaves differently depending on whether theversion you are downgrading to was previously installed on the appliance: When you revert to a previously installed IPSO version, the system accesses and uses thenetwork connectivity information configured for that version. When you downgrade to an earlier IPSO version that has never been installed on yourappliance, the system carries over the configuration information related to basicconnectivity. This functionality allows you to perform this type of downgrade over anetwork connection.You can use this method to downgrade to IPSO 3.6 and later.
