How to change the ip's of a cluster?

I have the following "hosts" file :
127.0.0.1     localhost     
10.1.1.2     itellin2
10.1.1.1     itellin1     loghost     itellin1.net
#logical-hosts
10.1.1.3     isccwork
10.1.1.4     ismswork
#sc-ip-address
10.1.1.11     itellin1-sc
10.1.1.12     itellin2-sc
#IPMP-test-IP-address
10.1.1.21     itellin1_ipmp0_test0
10.1.1.22     itellin1_ipmp0_test1
10.1.1.23     itellin2_ipmp0_test0
10.1.1.24     itellin2_ipmp0_test1
I want to change the IP's of this node and the opposite node.
How to do this with no problem in starting the cluster.

I'm not quite sure what you meant by "with no problem in starting the cluster.", I assume you mean "without rebooting the cluster"?
I'm also not clear what the difference is between the itellin1 and itellin1-sc names and addresses are. I assume the -sc is a system controller? If so, it's usually best practice to have this on a separate subnet, rather than on the public network. This is purely for security reasons.
First and foremost, I would do this during a planned maintenance period (obviously) and give yourself time to reboot if things going wrong. To change the IP addresses on the cluster nodes you will need a service outage. First, you will need to stop any services that use isccwork and ismswork. Then you can change the IP addresses of the nodes using ifconfig, you'll need to do this from the console rather than a telnet session. Then you can change the IP addresses of the services and then you can bring the services back online.
This should work, but I haven't actually tried this (recently).
Regards,
Tim
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