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Phased upgrade

A phased upgrade minimizes downtime by upgrading portions of the cluster, one at a time. Although the entire cluster is offline for a shorter period than a full upgrade, this method requires command-line interaction and some manual configuration. Each phase of the phased upgrade should be performed on more than one node of the cluster. Cluster will be offline only during step 4 and step 5 below for a phased upgrade.

  Note   A phased upgrade should not be performed from one of the nodes in the cluster.

The stages of the phased upgrade procedure are:

1. Select two or more nodes to upgrade.
2. Install the new version.
3. Shut down VCS on remaining non-upgraded nodes.
4. Modify the configuration information in the main.cf file.
5. Install the new version on each remaining node and reboot them.