Oracle Database Discussions

hi all

i am using oracle database 11g R2
Oracle Grid 11g R2
Oracle Linux 5.5

i want to know about DNS and Scan name.
i read somewhere that for installation purposes we need to define or configure Scan name in /etc/hosts
and i also read that we do not need to configure Scan Name with IP address in /etc/hosts.
and for Rac we need three DNS if yes then how could we configure three DNS and what will be
purpose of these three DNS?

as i configured SCAN NAME in hosts
but when i look for scan name then it just returned lisntener as true without scan name and IP address.
and i also create nslookup script with my scan name and ip address.
192.167.1.187 racnode-cluster-scan

and this the code i used.

#!/bin/bash

HOSTNAME=${1}

if [[ $HOSTNAME = "
                                      
racnode-cluster-scan" ]]; then
    echo "Server:          
                                      
24.154.1.34"
    echo "Address:         
                                      
24.154.1.34#53"
    echo "Non-authoritative answer:"
    echo "Name:    
                                      
racnode-cluster-scan"
    echo "Address:  
                                      
192.168.1.187"
else
    /usr/bin/nslookup.original $HOSTNAME
fi

and here the nslookup result.

[grid@racnode1 ~]$ cluvfy comp scan -verbose

Verifying scan 

Checking Single Client Access Name (SCAN)...
  SCAN VIP name     Node          Running?      ListenerName  Port          Running?    
  ----------------  ------------  ------------  ------------  ------------  ------------
  racnode-cluster-scan  racnode2      true          LISTENER      1521          true        

Checking name resolution setup for "racnode-cluster-scan"...

ERROR: 
PRVF-4664 : Found inconsistent name resolution entries for SCAN name "racnode-cluster-scan"
  SCAN Name     IP Address                Status                    Comment   
  ------------  ------------------------  ------------------------  ----------
  racnode-cluster-scan  192.167.1.187             failed                    NIS Entry 

ERROR: 
PRVF-4657 : Name resolution setup check for "racnode-cluster-scan" (IP address: 192.167.1.187) failed

ERROR: 
PRVF-4664 : Found inconsistent name resolution entries for SCAN name "racnode-cluster-scan"

Verification of SCAN VIP and Listener setup failed

Verification of scan was unsuccessful on all the specified nodes. 
[grid@racnode1 ~]$ 

note: i did not configure DNS for my network DNS is empty.

NISHA

Edited by: nisha on May 29, 2011 11:36 AM