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218 Nokia Network Voyager for IPSO 4.0 Reference Guide
For All Upgrades
When upgrading a cluster, make sure that all the nodes run the same versions of IPSO (and
NGX, when appropriate). If you are upgrading both IPSO and NGX, you should first upgrade
IPSO on all the nodes and then upgrade NGX. This approach provides the best continuity of
service during the upgrade process.
Upgrading from IPSO 3.7 or Later
If you want to upgrade a cluster from IPSO 3.7 or later to a later version of IPSO, Nokia
recommends 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 the
earlier version of IPSO.
The hash selection is not used by IPSO 3.8 and NG AI and no longer appears in the Clustering
Setup Configuration page. Depending upon how you upgrade to IPSO 3.8 and NG AI, you might
temporarily see this option. If you do you can safely ignore it. Once the upgrade is complete and
IPSO has verified that NG AI is running, the option disappears.
Upgrading from IPSO 3.6
Upgrading a cluster from IPSO 3.6 to IPSO 3.7 or later requires a different process because
IPSO 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 you
first upgrade all the nodes to IPSO 3.7 and then upgrade to 3.8. Following this process allows the
cluster to remain in service throughout the upgrade. The upgraded nodes retain any cluster
configuration information that was created with the earlier version of IPSO.
Note
Make sure that you use a version of NGX that is compatible with the IPSO version that you
upgrade the cluster to. If you are using an incompatible version of NGX, upgrade to a
compatible version after you upgrade to the later version of IPSO. See the IPSO Release
Notes and Getting Started Guide to find out which versions of NGX are compatible with the
version 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, but
Nokia strongly recommends that you upgrade all the nodes of your IPSO 3.6 clusters. IPSO
supports a 3.6 master with 3.7 or later members to allow a cluster to remain in service during an
upgrade.
To upgrade IPSO on cluster nodes and ensure that there are the minimum number of master
transitions, follow the steps below. This procedure assumes that you are upgrading a three-node
cluster in which node C is the master. Under this procedure, two cluster nodes are in service at
all times.