You can perform rolling upgrades of Oracle Grid Infrastructure in batches.
You can use
root user automation to automate running the
rootupgrade.sh script during the upgrade. When you use
root user automation, you can divide the nodes into groups, or batches, and start upgrades of these batches. Between batches, you can move services from nodes running the previous release to the upgraded nodes, so that services are not affected by the upgrade. Oracle recommends that you use
root automation, and allow the
rootupgrade.sh script to stop and start instances automatically. You can also continue to run
root scripts manually.
When you upgrade Oracle Grid Infrastructure without using
root user automation, you upgrade the entire cluster. You cannot select or de-select individual nodes for upgrade. Oracle does not support attempting to add additional nodes to a cluster during a rolling upgrade. Oracle recommends that you leave Oracle RAC instances running when upgrading Oracle Clusterware. When you start the
root script on each node, the database instances on that node are shut down and then the
rootupgrade.sh script starts the instances again.
Restrictions for Selecting Nodes for Batch Upgrades
The following restrictions apply when selecting nodes in batches for upgrade:
You can pool nodes in batches for upgrade, up to a maximum of three batches.
The local node, where Oracle Universal Installer (OUI) is running, must be upgraded in batch one.