AIX ISSUES

1.       Hi Friends, 
we have a HACMP cluster setup with 3 node cluster. 2 servers are active and 1 is standby. Now in one of the node we have a RG and 2 VGs with 1 service IP. now i want to rename the application server name and i want to change the service ip. could anyone tell me the procedure how to change the service IP in RG. 

 : Make sure the new ip address is in /etc/hosts. 
Then for service ip: 
smit hacmp 
Extended Configuration 
Extended Resource Configuration 
HACMP Extended Resources Configuration 
Configure HACMP Service IP Labels/Addresses 
Change/ Show a Service IP Label/Address 

For application server: 
smit hacmp 
Extended Configuration 
Extended Resource Configuration 
HACMP Extended Resources Configuration 
Configure HACMP Applications Servers 
Configure HACMP Application Servers 
Change/Show an Application Server

2.       do we need downtime to make these changes? will this change impact to other active node? 

 ANS: It is always recommended after done any configuration changes in cluster 
level, to perform the failover test, to confirm that the changes made are 
working fine. so take minimal down time to change the configuration and 
failover test.