Owner's Manual

Configuring Your Network 15

For a Cluster Using DNS

To set up an Oracle 11g R2 RAC using Oracle DNS (without GNS):

At least two interfaces configured on each node, one for the private IP

address and one for the public IP address.

A SCAN NAME configured on the DNS for Round Robin resolution to three

addresses (recommended) or at least one address. The SCAN addresses must

be on the same subnet as virtual IP addresses and public IP addresses.

NOTE:

For high availability and scalability, it is recommended that you configure the

SCAN to use Round Robin resolution to three IP addresses. The name for the SCAN

cannot begin with a numeral. For installation to succeed, the SCAN must resolve to at

least one address.

Table 2-3 describes the different interfaces, IP address settings and the resolutions

in a cluster.

Configuring a DNS Server

To configure changes on a DNS server for an Oracle 11g R2 cluster using a DNS

(without GNS):

Configure SCAN NAME resolution on DNS server. In the DNS, create a

name resolution entry for the GNS virtual IP address in the forward Lookup

file. For example:

scancluster IN A 192.0.2.1

IN A 192.0.2.2

IN A 192.0.2.3

Where

scancluster

is the SCAN NAME provided during grid installation.

NOTE:

The SCAN IP address must be routable and must be in public range.

Table 2-3. IP Address Settings in a Cluster Using DNS

Interface Type Resolution

Public Static /etc/hosts or DNS

Private Static Not required

Node virtual IP Static /etc/hosts or DNS

SCAN virtual IP Static DNS

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