Originally posted by: alaix

Hi,

We have to move a hacmp cluster to another vlan so we need to change all the IP adresses on both cluster (mutual)
Did anybody has already done it ? if so Can you give me the steps to follow exactly ??? please

Here what I think should be done:

• stop the cluster
• change the ip adresses via the console
• update /etc/hosts file
• start the cluster
• change the ip Label (topology) for all (service, standby, boot, heartbeat)

do we need to rebuild the resource group ? or modify something else ?
Thanks in advance
Al
#AIX-Forum

Originally posted by: grukrz1

Make cluster snapsot backup first (even on all cluster nodes).

Additionaly, I would save for cluster configuration to text files for later (reconfiguration) usage:

All: /usr/sbin/cluster/utilities/cllscf
Interfaces: /usr/sbin/cluster/utilities/cllsif
Resource group configuration: /usr/sbin/cluster/utilities/clshowres
Application servers: /usr/sbin/cluster/utilities/cllsserv

• stop the cluster
• update /etc/hosts file on all cluster nodes
• change the ip adresses via the console in ODM (smitty chinet) on all nodes
• change default gateway (remove old and add new one) on all nodes
• change the ip Label (topology) for all (service, standby, boot, heartbeat, persistent) in HA configuration (I would remove old network configuration and create new ones)
• change service IP labels in resource group configurations on node1
• change preffered network usage for NFS mounts if configured
• change application server scripts if they are reflecting to old IP addresses
• (probably not necessary but I would do it): remove hacmp configuration on the other node(s) (eg. node2)
• run cluster synchronization on node1 (modified one)
• if verification passed then start the cluster

If new network for the cluster is prepared and works fine, there should be no problems during such move.
#AIX-Forum