As per Note 220970.1 RAC: Frequently Asked Questions
Can I change the public hostname in my Oracle Database 10g Cluster using Oracle Clusterware?

Hostname changes are not supported in Oracle Clusterware (CRS),

unless you want to perform a deletenode followed by a new addnode operation.

The hostname is used to store among other things the flag files and Oracle Clusterware stack will not start if hostname is changed.























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