SCAN Ip addresses

Hi,
doest the scan DNS entry needs to point to the node's public ip address? or that i need to allocate 3 new ip address from the same subnet as my cluster's public ip?
http://www.oracle.com/technology/products/database/clustering/pdf/scan.pdf
1. Define the SCAN in your corporate DNS (Domain Name Service)
2. Use the Grid Naming Service (GNS).
"If you choose Option 1, you must ask your network administrator to create a single name that resolves to 3 IP
addresses using a round robin algorithm. The IP addresses must be on the same subnet as your public network in the
cluster."

you need to allocate 3 new ip addresses for scan from the same subnet the public ip is from.
for e.g.
two node cluster the dns entries can be like this
================
node1 and node2
===============
node1-vip.domainname 192.168.1.10
node2-vip.domainname 192.168.1.20
scan.domainname 192.168.1.11
scan.domainname 192.168.1.12
scan.domainname 192.168.1.13

Similar Messages

Oracle11gR2 SCAN IP address (RAC implementation)

Hello
If you refer to [http://download.oracle.com/docs/cd/E11882_01/rac.112/e10743/preparing.htm] (2 Day + Real Application Clusters Guide
11g Release 2) it has assigned three IP addresses for SCAN (while it uses two servers)
during installation it creates three more IP addresses on those two nodes and defines three SCAN_LISTENER for them (one of servers has two SCAN_LISTENER and another one has one SCAN_LISTENER)
My question is if we wanna implement RAC on more that two servers , do we need assign more than three IP addresses ? if yes what is rate of SCAN IP addresses number to server number ?
thanks

You will always have three dedicated IPs for SCAN, regardless of the number of nodes in your cluster.
Definition:
http://download.oracle.com/docs/cd/E11882_01/rac.112/e10717/glossary.htm#CBACGHFE
Explanation:
http://download.oracle.com/docs/cd/E11882_01/rac.112/e10717/intro.htm#sthref44
-Mark

SCAN IP address in RAC not accessible by clients

I have a 2 node Oracle RAC configuration running on Solaris 10 update 10 x86 with Oracle 11.2.0.1 DB installed on each node in a lab environment.
I am having problems connecting to the SCAN IP address with clients (Microsoft Access client talking to the Oracle RAC). I can only connect with clients using the IP addresses of the individual nodes in the cluster. This is my first RAC install. We are NOT using DNS only the /etc/hosts file. I see the IP address that is used as the cluster IP address associated with only one node of my two which is correct I believe.
Here is some displays from the cluster:
oracle@mortlach srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node elijahcraig
oracle@mortlach srvctl status scan
SCAN VIP scan1 is enabled
SCAN VIP scan1 is running on node elijahcraig
oracle@mortlach lsnrct status
bash: lsnrct: command not found
oracle@mortlach lsnrctl status
LSNRCTL for Solaris: Version 11.2.0.1.0 - Production on 27-APR-2011 18:35:57
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Solaris: Version 11.2.0.1.0 - Production
Start Date 27-APR-2011 13:33:40
Uptime 0 days 5 hr. 2 min. 17 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /opt/11.2.0/grid/network/admin/listener.ora
Listener Log File /opt/oracle/diag/tnslsnr/mortlach/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.80.180.77)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.80.180.249)(PORT=1521)))
Services Summary...
Service "hsmtest" has 1 instance(s).
Instance "hsmtest2", status READY, has 1 handler(s) for this service...
Service "hsmtestXDB" has 1 instance(s).
Instance "hsmtest2", status READY, has 1 handler(s) for this service...
The command completed successfully

Sure here is the requested data...Note the scan address has been moved to another node in the cluster so that is the information i am providing now
thanks for any help you can provide... :-)
Yes I can ping the SCAN-IP address from my client
oracle@mortlach srvctl status scan
SCAN VIP scan1 is enabled
SCAN VIP scan1 is running on node mortlach
oracle@mortlach ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.80.180.77 netmask fffffe00 broadcast 10.80.181.255
bge0:1: flags=1040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4> mtu 1500 index 2
inet 10.80.180.249 netmask fffffe00 broadcast 10.80.181.255
bge0:3: flags=1040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4> mtu 1500 index 2
inet 10.80.180.253 netmask fffffe00 broadcast 10.80.181.255
nge1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
inet 192.168.180.77 netmask fffffe00 broadcast 192.168.181.255
oracle@mortlach lsnrctl status LISTENER_SCAN1
LSNRCTL for Solaris: Version 11.2.0.1.0 - Production on 28-APR-2011 07:54:47
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))
STATUS of the LISTENER
Alias LISTENER_SCAN1
Version TNSLSNR for Solaris: Version 11.2.0.1.0 - Production
Start Date 26-APR-2011 17:07:25
Uptime 1 days 14 hr. 47 min. 22 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /opt/11.2.0/grid/network/admin/listener.ora
Listener Log File /opt/11.2.0/grid/log/diag/tnslsnr/mortlach/listener_scan1/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.80.180.253)(PORT=1521)))
Services Summary...
Service "hsmtest" has 2 instance(s).
Instance "hsmtest1", status READY, has 1 handler(s) for this service...
Instance "hsmtest2", status READY, has 1 handler(s) for this service...
Service "hsmtestXDB" has 2 instance(s).
Instance "hsmtest1", status READY, has 1 handler(s) for this service...
Instance "hsmtest2", status READY, has 1 handler(s) for this service...
The command completed successfully
oracle@mortlach lsnrctl status LISTENER_SCAN1
LSNRCTL for Solaris: Version 11.2.0.1.0 - Production on 28-APR-2011 07:54:47
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))
STATUS of the LISTENER
Alias LISTENER_SCAN1
Version TNSLSNR for Solaris: Version 11.2.0.1.0 - Production
Start Date 26-APR-2011 17:07:25
Uptime 1 days 14 hr. 47 min. 22 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /opt/11.2.0/grid/network/admin/listener.ora
Listener Log File /opt/11.2.0/grid/log/diag/tnslsnr/mortlach/listener_scan1/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.80.180.253)(PORT=1521)))
Services Summary...
Service "hsmtest" has 2 instance(s).
Instance "hsmtest1", status READY, has 1 handler(s) for this service...
Instance "hsmtest2", status READY, has 1 handler(s) for this service...
Service "hsmtestXDB" has 2 instance(s).
Instance "hsmtest1", status READY, has 1 handler(s) for this service...
Instance "hsmtest2", status READY, has 1 handler(s) for this service...
The command completed successfully
oracle@mortlach grep mortlac-cluster /etc/hosts
10.80.180.253 mortlac-cluster

Scan Email Address Book Group

The scanning and senting to the groups works fine with one exception:
Let's add a group of users:
[email protected]
[email protected]
[email protected]
[email protected]
When these are added into a group evertone will receive the emails but the email received to the recipient will list every name and email address on the "To:" line in the received email. This allows all recipients to see and access everyone elses email address. That is a real problem.
Example (of an email send by [email protected] to the above group):
From: [email protected]
To: [email protected]; [email protected]; [email protected]; [email protected]
Please explain how to modify the email groups so the entire group is not visible to the recipients
Thanks!
Drew

Hello BayPally,
Welcome to the HP Forums.
I see that you are having an issue with the multiple email addresses being visible when scanning and sending a group email.
This is one of those things that can not be changed.
I do realize it is frustrating for you however this is just one of those things.
Thanks for your time.
Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
W a t e r b o y 71
I work on behalf of HP

Where to configure the SCAN address?

Hi,
I'm in the middle of installing the Grid infrastructure cluster for Oracle 11gR2 RAC on AIX 6.1
I had defined the public IPs, private IPs and interconnects in the DNS and hosts files. I am not using GNS because we use static IP Address, no DHCP.
during the installation, I will be asked for SCAN IP address, which I prepared and resolved by DNS, but I don't know where to configure it
The SCAN IP address is not pingable but can be lookedup and I get the reply to it
Where I put it, in the Rack Switch or shall I choose different installation method.
Kindly advice
Regards,
C.

Oracle is clear about the use of /etc/hosts to configure the SCAN:
See Note: *11gR2 Grid Infrastructure Single Client Access Name (SCAN) Explained [ID 887522.1]*
Instead of DNS or GNS, Can we use '/etc/hosts' to resolve SCAN?
Oracle strongly recommends that you do not configure SCAN VIP addresses in the hosts file. If you use the hosts file to resolve SCANs, then you will only be able to resolve to one IP address and you will have only one SCAN address - be sure to provide a hosts file entry for each SCAN address in hosts file in same order.
If hosts file is used to resolve SCAN hostname, you will receive Cluster Verification Utility failure at end of installation (See NOTE: 887471.1 for more details)
However, since you have already installed with the configuration in the /etc/hosts, you can fix this by configuring the IP addresses in the DNS (since you don't use GNS) and follow the following note to modify the SCAN settings:
*How to Modify SCAN Setting after Installation [ID 972500.1]*
Herve Etche

8600 plus with mac osX, need to delete email addresses from scanner

Have Mac osX snow leopard, need to remove/delete email addresses from my scanner list. Have tried to follow other posts to solve but they don't seem to help as I can't find the specific network folder. Thanks, Chuck

Hi @oreganocrk ,
I see by your post that you would like to delete email addresses from the scanner list. I would like to help.
Print a configuration page to get the printer's IPv4 address. Printing a Network Configuration Page.
Access the Embedded Web Server for the printer. Type the IP address into your web browser's address bar.
Click on the Scan tab, Scan to email on the left side of the window, select Scan to address book.
Check the email that you would like to remove and click delete.
If you need further assistance, just let me know.
Have a nice day!
Thank You.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Gemini02
I work on behalf of HP

How to failover SCAN VIP and SCAN Listener from one node to another?

Environment:
O.S : HP-UX B.11.31 U ia64
RDBMS: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
It is a 2 Node RAC.
Question:
How to failover the SCAN VIP and SCAN LISTENER running on node 1 to node 2?
What is the relation between standard LISTENER and SCAN LISTENER ?
Why do we need LISTENER, when we have SCAN LISTENER ?
When I tried with SRCVTL STOP LISTENER , I thought the SCAN LISTENER adn SCAN IP will failover, but it did not?
Also please clarify if I use SRVCTL RELOCATE SCAN -i 1 -n Node1
Actalluy I am trying that by moving the SCAN listeners so that when I do PSU 7 patching on 1 node, no incoming attempt to connect will spawn
a process and thereby opening files in $ORACLE_HOME (which would prevent the patch from occurring)
Please clarify my queries.
Thanks, Sivaprasad.S

Hi Sivaprasad,
1. The following link will help you for SCAN VIP and SCAN LISTENER failover from 1 node to another.
http://heliosguneserol.wordpress.com/2012/10/19/how-to-relocate-scan_listener-from-one-node-to-another-node-on-rac-system/
http://oracledbabay.blogspot.co.uk/2013/05/steps-to-change-scan-ip-address-in.html
2. The Standard LISTENER is specific for particular node for which it is running. It cannot be relocated as its specific for the node its running. SCAN listeners are not replacements for the node listeners.A new set of cluster processes called scan listeners will run on three nodes in a cluster (or all nodes if there are less than 3). If you have more than three nodes, regardless of the number of nodes you have, there will be at most three scan listeners. So no relation for standard LISTENER and SCAN LISTENER.
3. Hmmm. let me put it in easy way for this question. All the RAC services like, asm, db , services, nodeapps registers with this SCAN_LISTENER. So if any of these services (asm, db , services, nodeapps) got down/not running, the SCAN_LISTENER will know the down status, and if any client requests to access the node/service which is down, the SCAN_LISTENER will redirect the client request to the least loaded node. So here all these process will happen without the knowledge of client. And As usual the standard LISTENER looks only for incoming request to connect with the database. So we need both LISTENER and SCAN LISTENER.
4. If you provide SRCVTL STOP LISTENER, it stops the default listener on the specified node_name, or the listeners represented in a given list of listener names, that are registered with Oracle Clusterware on the given node. No failover will happen under this case.
5. Yes you can relocate if you want to relocate the scan.
Hope this helps!!
Regards,
Pradeep. V

Ora-12514 connect to SCAN listener in dataguard RAC environment

I have two rac nodes datase on linux and two rac standby database also.
Here are what I got when I try to connect to scan listener from client. It connects to vip/or scan ip addresses without any problem.
sqlplus system/password@wxcy
SQL*Plus: Release 10.2.0.3.0 - Production on Wed Mar 14 18:42:42 2012
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
But when I log in to the ip address of the scan listener, it worked:
sqlplus system/[email protected]:1521/wxcy
SQL*Plus: Release 10.2.0.3.0 - Production on Wed Mar 14 18:43:12 2012
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL>
Here is the tnsnames.ora on the client:
wxcy =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)
(HOST = scan.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = wxcy)
Here are listener.ora and tnsnames.ora on the server:
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))) # line added by Agent
LISTENER_SCAN3=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN3)))) # line added by Agent
LISTENER_SCAN2=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2)))) # line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))) # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN2=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN3=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON # line added by Agent
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = wxcy_DGMGRL)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME = wxcy1)
SID_LIST_LISTENER_SCAN1 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = wxcy)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME = wxcy1)
SID_LIST_LISTENER_SCAN3 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = wxcy)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME = wxcy1)
INBOUND_CONNECT_TIMEOUT_LISTENER = 120
~
tnsnames.ora:
wxcy =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = scan.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = wxcy)
wxcy_DGMGRL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = scan.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = wxcy_DGMGRL)
wxcy1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = scan.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)(SERVICE_NAME = wxcy)
(INSTANCE_NAME = wxcy1)
wxcy2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = scan.com)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)(SERVICE_NAME = wxcy)
(INSTANCE_NAME = wxcy2)
From node 2:
LISTENER_SCAN2=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2)))) # line added by Agent
LISTENER_SCAN3=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN3)))) # line added by Agent
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))) # line added by Agent
LISTENER_SCAN1=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN1)))) # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN3=ON # line added by Agent
ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN2=ON # line added by Agent
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = wxcy_DGMGRL)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME = wxcy1)
SID_LIST_LISTENER_SCAN2 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = wxcy)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME = wxcy2)
SID_LIST_LISTENER_SCAN3 =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = wxcy)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME = wxcy2)
I wonder why I can connect to the ip addresses of those scan listener but not the scan name.
Thanks.

Hello;
This note may help :
How to Troubleshoot Connectivity Issue with 11gR2 SCAN Name [ID 975457.1]
Also I would check my DNS ( OK double check ) and each listener service as follows :
lsnrctl service LISTENER_SCAN1
( and so on )
Also
Make sure a password file exists on on that node. ( A copy - Create new with Oracle 11 DG does not work )
Best Regards
mseberg
Edited by: mseberg on Mar 14, 2012 5:10 PM

SCAN Name issue in Oracle 11gR2 RAC Installation

Hi,
I am trying to install Oracle 11gR2 RAC on VM ware and I got the INS-40922 (Invalid SCAN name). Do I need to create the SCAN name prior to the installation?
I have public,private, and VIP's. I am not sure how I create this SCAN Name. Please share your thoughts
Thanks

During installation of grid infrastructure SCAN will be automatically created. If you are using DNS then put the scan name and scan ip addresses entries in DNS . If you are not using dns/gns then put scanname and scan ipadress hosts file on each node in the cluster. Before installation, you should not be able to ping scan ipadresses.

Accessing Enteprise Manager via Cluster Scan VIP

Hello all...
We have a few clusters set up, and we've been accessing Enterprise Manager for these via the cluster scan IP address. For some unknown reason we now cannot access two of the three OEM installations via the scan IP, only by the IP address of the first node. Unfortunately I wasn't involved in this stage of the setup and I'm not having a lot of luck finding docs relevant to this.
The clusters are running 11.2.0.2 Standard with the January 2012 patch set, and the nodes in the clusters with the issue don't have any problem pinging each other or the scan URL for the custer, if that's helpful.
Can someone point me in the right direction?
Thanks,
Dan
Edited by: ddenton on Apr 20, 2012 11:11 AM
Edited by: ddenton on Apr 20, 2012 11:18 AM

Ravi,
DB Control was set up independently of the database using "emca".
The scan name in the emoms.properties file does match up with what's listed when running the "srvctl config scan" command.
When I attempt to connect to the scan address from Node2 using the following command, I get this response:
[oracle@devdb2 ~]$ sqlplus username/[email protected]:1521/DEVDB
SQL Plus: Release 11.2.0.2.0 Production on Mon Apr 23 10:41:00 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor
I have no problem tns pinging the scan name or the database name:
[oracle@devdb2 ~]$ tnsping devdb-scan.rp.db
TNS Ping Utility for Linux: Version 11.2.0.2.0 - Production on 23-APR-2012 10:42:10
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
Used HOSTNAME adapter to resolve the alias
Attempting to contact (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=))(ADDRESS=(PROTOCOL=TCP)(HOST=10.10.10.130)(PORT=1521)))
OK (0 msec)
[oracle@devdb2 ~]$ tnsping DEVDB
TNS Ping Utility for Linux: Version 11.2.0.2.0 - Production on 23-APR-2012 10:42:34
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = devdb1-vip.company.com)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = devdb2-vip.company.com)(PORT = 1521)) (LOAD_BALANCE = yes) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = DEVDB.company.com)))
OK (0 msec)
Connecting using the following command directly to the TNS name for the database works too, so I'm a bit confused as to why specifying the scan name with port doesn't...
[oracle@devdb2 ~]$ sqlplus username/password@DEVDB
SQL*Plus: Release 11.2.0.2.0 Production on Mon Apr 23 16:16:40 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Release 11.2.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options
SQL>
##################################

Question related to connection using SCAN listeners

Hi All,
We have 2 Sets of 11gr2 RAC servers like below.Application (using Oracle client) is connecting to the Server A&B all the time using SCAN IP's.
Server A,Server B --> Primary Database (RAC Instances)
Server C,Server D --> Physical Standby Database (RAC Instances)
Currently we have below queries ?
1) In Case of COB situation or Server A & B crash situation. we need to open the Server C & D instances for the application availablity in that situation how to acheive the connection without changing the tnsnames.ora, Is there any way to give multiple SCAN IP Addresses in the tnsnames.ora ? or Is there any other way ?
Regards
Kamal

790841 wrote:
Hi All,
We have 2 Sets of 11gr2 RAC servers like below.Application (using Oracle client) is connecting to the Server A&B all the time using SCAN IP's.
Server A,Server B --> Primary Database (RAC Instances)
Server C,Server D --> Physical Standby Database (RAC Instances)
Currently we have below queries ?
1) In Case of COB situation or Server A & B crash situation. we need to open the Server C & D instances for the application availablity in that situation how to acheive the connection without changing the tnsnames.ora, Is there any way to give multiple SCAN IP Addresses in the tnsnames.ora ? or Is there any other way ?Since your switch over from primary to standby and vice-versa is a manual process, why not configure the same SCAN addresses on both clusters. Stop the SCAN on Standby and then Stop on primary and start it on Standby as a part of this process.
>
Regards
Kamal

RAC SCAN confusion.

Oracle RAC needs two ip address one for the private interconnect and one for the VIP (for the uses and applications to connect to). oracle also says that a network interface should not be bound to any of the scan ip address. my doubt is.
1. if we have about 9 nodes in the cluster. oracle says that the scan name can resolve to a maximum of 3 ip address. does this mean that we need 3 oracle scans.
2. REALLY CONFUSED HERE scan ip address is not bound to any network interface. so the clients will be connecting using the scan vip. now..
oracle needs two ip address one for private (one network interface) and
public (vip another network interface) (here do we need an additional network interface card for the SCAN with out any ip assigned to it). so if scan needs an additional interface card then it makes that we need 3 interface card right.
3. oracle RAC instance registers only with SCAN listeners (is it correct). if correct then can we have a single SCAN listener listening to 3 network ipaddress that the scan resolves to. or do we need 3 scan listeners for this purpose each listener listening to one ip address scan resolves to. and more over will these 3 listeners to be configured on all of the nodes.
please help guys,

I think your confusing stems from the number of NICs (Network Interface Controllers) you expect there to be.
For each RAC node server, 2 NICs are required.
A public NIC. This means it is wired into a public switch and connected to your company LAN/WAN. There are potentially 3 IP addresses than can run on the public NIC:
- static IP (fixed IP for that server)
- virtual IP (virtual failover IP for that server)
- SCAN IP (single access IP for the cluster)
Should other nodes in the cluster fail, more IPs will exist on the public NIC. Let's say 8 of your 9 nodes fail. The remaining node will failover the 8 downed nodes's virtual IPs. So it will have 9 virtual IPs in total on the public NIC. Plus its static IP. Plus any SCAN IPs.
A private NIC. This should be wired into a private switch. This private switch should serve as the dedicated Interconnect switch. The only external access (into your company LAN/WAN) from this switch should be its management port - allowing your NA's (Network Admins) to administer and manage the private switch.
A single IP, the Interconnect IP, should exist on the private NIC.
A server can also use bonded NICs. For example, the server has 3 NICs. Two of these are bonded, creating a single logical public NIC. The remaining NIC serves as the private NIC. Or vice versa. Or both public and private interfaces can be bonded separately.
The SCAN name is simply a single hostname that the client needs to know. In a 100 node 10g cluster, each client needs to know all 100 virtual IPs/hostnames in order for high availability to work seamlessly. It is much easier for the client to remember a single hostname instead - and via this hostname being able to connect to any one of the 100 available RAC nodes.
The SCAN name must resolve to at least a single IP. That SCAN IP must exist (be bound) on one of the public NICs of the cluster. A SCAN name can also resolve to more than one IP (max 3 on 11gr2 I think). In that case, all 3 of those SCAN IPs need to be bound to a public NIC of a cluster node. Should a node that manages a SCAN IP fail, that will failover to another node just like its virtual IP.

For 4 node RAC database on Exadata x3-2, how many scan IP I should assign?

We want to build a 4 node RAC 11gr23 on exadata x3-2. Oracle only recommend 3 ip for scan listener. by previous observation of non-exadata RAC, seems each node will spread randomly one Scan Ip address. So if we assign 3 ip to one scan listener, how that will work on a 4-node RAC?
Thanks

You're welcome
by Load balancing
Oracle RAC databases increase load balancing by using the single client access name (SCAN) for the cluster to balance connections among all instances in a cluster database. SCAN also adds location independence for the databases, so that client configuration does not have to depend on which nodes are running a particular database or database instance.
http://docs.oracle.com/cd/E11882_01/install.112/e48195/undrstnd.htm#RIWIN607
Based on the environment, the following actions occur when you use SCAN to connect to an Oracle RAC database using a service name. The numbered actions correspond to the arrows shown in Figure 7-1.
http://docs.oracle.com/cd/E11882_01/install.112/e48195/undrstnd.htm#CIHIBEIH
Regards

11gR2 SCAN config with F5 load balancer

We are getting ready to set up our first RAC 2-node configuration. The hardware had already been purchased before deciding to go with 11gR2. Therefore, we have an F5 load balancer. The question is...can we use the IP address of the F5 in the /etc/hosts file as the SCAN IP address? Would this get us around the need to have a DNS configured SCAN host name?
Has anyone done this before?
Thanks,
Mike

Hi Mike,
Welcome to the forum.
I dont know works F5 Load Balancer.
But i'll try...
The question is...can we use the IP address of the F5 in the /etc/hosts file as the SCAN IP address?Oracle strongly recommends that you do not configure SCAN VIP addresses in the hosts file.
But if you use the hosts file to resolve SCAN name, you can have only one SCAN IP address. You will not get full functionality of the SCAN.
See this note on MOS:
*11gR2 Grid Infrastructure Single Client Access Name (SCAN) Explained [ID 887522.1]*
Would this get us around the need to have a DNS configured SCAN host name?If you want to use the SCAN feature, it is strongly recommended you use the DNS in your environment. This is my advice.
Read the note above or link below to understand how SCAN works
http://levipereira.wordpress.com/2010/12/18/single-client-access-name-scan-by-barb-lundhild/
Regards,
Levi Pereira
Please close your thread when you get the solution to your problem. 
Mark the replies answered "helpful" answer or "correct" answer that will help others with same problem. 
Thanks for doing your part to make this community as valuable as possible for everyone!

SCAN in Oracle 11g R2 RAC

Hi All,
Actually i am not having much idea on either Linux administration nor DB administration, Actually i am Test engg and my requirement is to setup Oracle 11gR2 RAC on Linux machine.
I have followed steps in http://www.oracle-base.com/articles/11g/OracleDB11gR2RACInstallationOnLinuxUsingNFS.php
Actually i am not clear with SCAN. Given some IP address of the main box names of the nodes.
Please can any one explain what should be the IP address that needs to enter as SCAN in /etc/hosts file.

I have used the IP address of the VM host which is having 2 nodes, It could be able to see in nslookup but not pingable.
Placed the same in /etc/hosts of both nodes. After installation of Grid infrastructure which i have issued ifconfig i could able to see the SACN IP address
Node 1:
eth0 : Public IP Address
eth0:2 Virtual IP address
eh0:3 SCAN IP address
eth1: Private IP
Node 2:
eth0 : Public IP Address
eth0:1 Virtual IP address
eth1: Private IP
Please let me know if the shown thing is correct or i did some mistake.

SCAN Ip addresses

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