Getting Started Guide

Preparing Nodes for Oracle Installation 13

Private Network

NOTE: Each of the two NIC ports for the private network must be on separate PCI

buses.

The grid infrastructure of Oracle 11gR2 (11.2.0.2) supports IP failover

natively using a newly introduced feature known as Redundant Interconnect.

Oracle uses its ora.cluster_interconnect.haip resource to communicate with

Oracle RAC, Oracle ASM, and other related services. The Highly Available

Internet Protocol (HAIP) has the ability to activate a maximum of four

private interconnect connections. These private network adapters can be

configured during the initial install process of Oracle Grid or after the

installation process using the oifcfg utility.

Oracle Grid currently creates an alias IP (as known as virtual private IP) on

your private network adapters using the 169.254.*.* subnet for the HAIP. If

the subnet range is already in use, Oracle Grid does not attempt to use it.

The purpose of HAIP is to load balance across all active interconnect

interfaces, and failover to other available interfaces if one of the existing

private adapters becomes unresponsive.

NOTE: When adding additional HAIP addresses (maximum of four) after the

installation of Oracle Grid, restart your Oracle Grid environment to make these new

HAIP addresses active.

The example below provides step-by-step instructions on enabling redundant

interconnect using HAIP on a fresh Oracle 11gR2 (11.2.0.2) Grid

Infrastructure installation.

Edit the file,

/etc/sysconfig/network-scripts/ifcfg-ethX

, where

is the

number of the eth device,

ifcfg-ethX

configuration files of the network

adapters to be used for your private interconnect. The following example

shows eth1 and eth2 using a 192.168.0.* subnet.

DEVICE=eth1

BOOTPROTO=static

HWADDR=00:1E:C9:4B:72:22

ONBOOT=yes

IPADDR=192.168.0.140

NETMASK=255.255.255.0