Check scan addresses [root@gract1 Desktop]# srvctl config scan SCAN name: gract-scan.grid12c.example.com, Network: 1 Subnet IPv4: 192.168.1.0/255.255.255.0/eth1, dhcp Subnet IPv6: SCAN 0 IPv4 VIP: -/scan1-vip/192.168.1.173 SCAN VIP is enabled. SCAN VIP is individually enabled on nodes: SCAN VIP is individually disabled on nodes: SCAN 1 IPv4 VIP: -/scan2-vip/192.168.1.165 SCAN VIP is enabled. SCAN VIP is individually enabled on nodes: SCAN VIP is individually disabled on nodes: SCAN 2 IPv4 VIP: -/scan3-vip/192.168.1.166 SCAN VIP is enabled. SCAN VIP is individually enabled on nodes: SCAN VIP is individually disabled on nodes: Verify SCAN addresses with nslookup [root@gract1 Desktop]# nslookup gract-scan.grid12c.example.com Server: 192.168.1.50 Address: 192.168.1.50#53 Non-authoritative answer: Name: gract-scan.grid12c.example.com Address: 192.168.1.173 Name: gract-scan.grid12c.example.com Address: 192.168.1.166 Name: gract-scan.grid12c.example.com Address: 192.168.1.165 Name: gract-scan.grid12c.example.com Address: 192.168.1.188 Name: gract-scan.grid12c.example.com Address: 192.168.1.190 Name: gract-scan.grid12c.example.com Address: 192.168.1.161 --> Here we get 6 addresses but expecting only 3 Note some of the addresses are not responding on ICMP/ping requests Check GNS status [root@gract1 ~]# $GRID_HOME/bin/srvctl config gns -list gract-scan A 192.168.1.161 Unique Flags: 0x81 gract-scan A 192.168.1.165 Unique Flags: 0x1 gract-scan A 192.168.1.166 Unique Flags: 0x1 gract-scan A 192.168.1.173 Unique Flags: 0x1 gract-scan A 192.168.1.188 Unique Flags: 0x81 gract-scan A 192.168.1.190 Unique Flags: 0x81 gract-scan1-vip A 192.168.1.173 Unique Flags: 0x1 gract-scan2-vip A 192.168.1.165 Unique Flags: 0x1 gract-scan3-vip A 192.168.1.161 Unique Flags: 0x81 gract-scan3-vip A 192.168.1.166 Unique Flags: 0x1 gract-scan3-vip A 192.168.1.188 Unique Flags: 0x81 gract-scan3-vip A 192.168.1.190 Unique Flags: 0x81 --> We have wrong addresses for gract-scan and gract-scan3-vip Delete unused SCAN VIP addresses 192.168.1.188, 192.168.1.190, 192.168.1.161 [root@gract1 Desktop]# srvctl update gns -delete gract-scan -address 192.168.1.161 [root@gract1 Desktop]# srvctl update gns -delete gract-scan -address 192.168.1.190 [root@gract1 Desktop]# srvctl update gns -delete gract-scan -address 192.168.1.188 [root@gract1 Desktop]# srvctl update gns -delete gract-scan3-vip -address 192.168.1.161 [root@gract1 Desktop]# srvctl update gns -delete gract-scan3-vip -address 192.168.1.190 [root@gract1 Desktop]# srvctl update gns -delete gract-scan3-vip -address 192.168.1.188 Restart DNS nameserver to clear cached addresses [root@ns1 Desktop]# service named restart Stopping named: . [ OK ] Starting named: [ OK ] Verify with nslookup [root@gract1 ~]# nslookup gract-scan.grid12c.example.com Server: 192.168.1.50 Address: 192.168.1.50#53 Non-authoritative answer: Name: gract-scan.grid12c.example.com Address: 192.168.1.173 Name: gract-scan.grid12c.example.com Address: 192.168.1.165 Name: gract-scan.grid12c.example.com Address: 192.168.1.166 --> works now Verify GNS entries for 2 node cluster [root@gract1 ~]# $GRID_HOME/bin/srvctl config gns -list | egrep 'vip|scan' gract-scan A 192.168.1.165 Unique Flags: 0x1 gract-scan A 192.168.1.166 Unique Flags: 0x1 gract-scan A 192.168.1.173 Unique Flags: 0x1 gract-scan1-vip A 192.168.1.173 Unique Flags: 0x1 gract-scan2-vip A 192.168.1.165 Unique Flags: 0x1 gract-scan3-vip A 192.168.1.166 Unique Flags: 0x1 gract1-vip A 192.168.1.160 Unique Flags: 0x81 gract2-vip A 192.168.1.172 Unique Flags: 0x1 Ping these addresses [grid@gract3 ~]$ ping gract1-vip [grid@gract3 ~]$ ping gract-scan1-vip [grid@gract3 ~]$ ping gract-scan ..