Change Cluster Interconnect Adapter & IP Address in 11gR2 RAC

Oracle RAC

We can change it at any stage, it require full outage.
Step 1: Determine private IP address
[[email protected] ~]$ oifcfg getif
eth0 192.168.1.0 global public
eth1 10.0.0.0 global cluster_interconnect

Step 2: Determine Ethernet card name
[[email protected] ~]$ oifcfg iflist
eth0 192.168.1.0
eth1 10.0.0.0

Step 3: Add new interface Subnet ID specification:
[[email protected] ~]$ oifcfg setif -global eth1/175.16.0.0:cluster_interconnect

Step 4 : Verify the changes:
[[email protected] ~]$ oifcfg getif
eth0 192.168.1.0 global public
eth1 10.0.0.0 global cluster_interconnect
eth1 175.16.0.0 global cluster_interconnect

Step 5: Stop cluster on all node:
[[email protected] ~]# sudo /u01/app/11.2.0/grid/bin/crsctl stop cluster -all

Step 6: Modify netwrok address on network adapter of each box:
[[email protected] ~]# ifconfig eth1 175.16.0.10 netmask 255.255.0.0 broadcast 175.16.255.255
[[email protected] ~]# ifconfig eth1 175.16.0.11 netmask 255.255.0.0 broadcast 175.16.255.255

Step 7: Modify /etc/hosts file on each node.

Delete entry of old private interconnect and add new private interconnect on each node.
[[email protected] ~]# cat /etc/hosts

Do not remove the following line, or various programs

that require network functionality will fail.

127.0.0.1 localhost.localdomain localhost

10.10.10.105 Jayesh1-priv.localdomain Jayesh1-priv

175.16.0.10 Jayesh1-priv.localdomain Jayesh1-priv

10.10.10.107 Jayesh2-priv.localdomain Jayesh2-priv

175.16.0.11 Jayesh2-priv.localdomain Jayesh2-priv

Step 8: Start cluster on each node
[[email protected] ~]# /u01/app/11.2.0/grid/bin/crsctl start cluster -all

Step 9: Delete old entry of private interconnect from cluster registry
[[email protected] ~]$ oifcfg delif -global eth1/10.0.0.0:cluster_interconnect

Step 10: Verify the changes:
[[email protected] ~]$ oifcfg getif
eth0 192.168.1.0 global public
eth1 175.16.0.0 global cluster_interconnect

You can also verify:
[[email protected] ~]# ifconfig eth1

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