How to rename SCAN in Cluster:

1. Stop the SCAN

[grid@rac1 ~]$ srvctl stop scan_listener
[grid@rac1 ~]$ srvctl stop scan

2.Configure the new SCAN in your DNS, or /etc/hosts, or GNS and make sure that lookups are working for the new name.

[root@rac2 ~]# nslookup newscan.domain.com


3. Configure the Cluster to take the new VIPs

As root user on one of the cluster nodes:

[root@rac1 ~]# /u01/product/11.2.0/grid/bin/srvctl modify scan -n newscan.domain.com

4.As grid user on one of the cluster nodes:
[grid@rac1 ~]$ srvctl modify scan_listener -u
[grid@rac1 ~]$ srvctl start scan_listener

5.Verify that configuration:

[grid@rac1 ~]$ srvctl config scan