5218 Nokia Network Voyager for IPSO 4.0 Reference GuideFor All UpgradesWhen upgrading a cluster, make sure that all the nodes run the same versions of IPSO (andNGX, when appropriate). If you are upgrading both IPSO and NGX, you should first upgradeIPSO on all the nodes and then upgrade NGX. This approach provides the best continuity ofservice during the upgrade process.Upgrading from IPSO 3.7 or LaterIf you want to upgrade a cluster from IPSO 3.7 or later to a later version of IPSO, Nokiarecommends that you use Cluster Voyager to upgrade the IPSO image on all the cluster nodes.See the instructions in “Installing IPSO Images.”The upgraded nodes retain any cluster configuration information that was created with theearlier version of IPSO.The hash selection is not used by IPSO 3.8 and NG AI and no longer appears in the ClusteringSetup Configuration page. Depending upon how you upgrade to IPSO 3.8 and NG AI, you mighttemporarily see this option. If you do you can safely ignore it. Once the upgrade is complete andIPSO has verified that NG AI is running, the option disappears.Upgrading from IPSO 3.6Upgrading a cluster from IPSO 3.6 to IPSO 3.7 or later requires a different process becauseIPSO 3.6 does not have cluster management functionality.If you want to upgrade cluster nodes from IPSO 3.6 to IPSO 3.8, Nokia recommends that youfirst upgrade all the nodes to IPSO 3.7 and then upgrade to 3.8. Following this process allows thecluster to remain in service throughout the upgrade. The upgraded nodes retain any clusterconfiguration information that was created with the earlier version of IPSO.NoteMake sure that you use a version of NGX that is compatible with the IPSO version that youupgrade the cluster to. If you are using an incompatible version of NGX, upgrade to acompatible version after you upgrade to the later version of IPSO. See the IPSO ReleaseNotes and Getting Started Guide to find out which versions of NGX are compatible with theversion of IPSO you are installing.A cluster functions if its master runs IPSO 3.6 and one or more nodes run IPSO 3.7 or later, butNokia strongly recommends that you upgrade all the nodes of your IPSO 3.6 clusters. IPSOsupports a 3.6 master with 3.7 or later members to allow a cluster to remain in service during anupgrade.To upgrade IPSO on cluster nodes and ensure that there are the minimum number of mastertransitions, follow the steps below. This procedure assumes that you are upgrading a three-nodecluster in which node C is the master. Under this procedure, two cluster nodes are in service atall times.
