SCAN & Cold Failover
Hi Folks
OEL 5.4 64bit, 11gR2
SCAN
I'm planning to install a two node cold failover cluster. I'm not sure whether it makes sense to use a SCAN listener or to do it the old fashion way (for each db a vip, which relocates with the db in the case the node goes down).
what's your opinion about this?
ASM for voting&ocr
I'm also planning to create one diskgroup in asm for 3xvoting and ocr, normal redundancy and 3 failgroups. Do I have to create the diskgroup with the QUORUM Keyword for each failgroup or not? as described here http://download.oracle.com/docs/cd/E11882_01/server.112/e10500/asmdiskgrps.htm#CHDBGAFB. I assume not, as they cannot store ocr files (http://download.oracle.com/docs/cd/E11882_01/server.112/e10592/statements_5008.htm#SQLRF01114).
what is your way to store the ocr and voting files?
is there a 11gR2 Version of this paper available (http://www.oracle.com/technology/products/database/clusterware/pdf/SI_DB_Failover_11g.pdf) ?
thanks
regards oviwan
SCAN
I'm planning to install a two node cold failover cluster. I'm not sure whether it makes sense to use a SCAN listener or to do it the old fashion way (for each db a vip, which relocates with the db in the case the node goes down).
1- You can not install the grid infrastructure without the SCAN even if you will not use it.
2 - The old fashion you described is what is still in use independently from SCAN. You still have a vip which relocates in case the node goes down.
Where you use the SCAN is when configuring the REMOTE LISTENER and ALIAS for clients. But for those purposes, you can use the «old fashion» if you don't want to use the SCAN. But i believe that you should use it because it makes things become more easier....
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Hi,
I wanted to use Data Guard Broker to control primary/standby systems on AIX clusters but found that without Oracle clusterware it is not supported on failover of a database to another node (unless you drop and recreate the configuration which in my opinion is not support at all!).
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Installation document recuired for Oracle 10g R2 on Cold Failover Cluster in Redhat Linux 4 platform.
Message was edited by:
user491196user12974178 wrote:
checking network configuration requirements
check complete: The overall result of this check is : Not Executed
Recommendation: Oracle supports installation on systems with DHCP - assigned public IP addresses.
However , the primary network Interface on the system should be configured with a static IP address
in order for the Oracle Software to function properly. See the Installation Guide for more details on installing the
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I'm running OAS 10.1.2.2.0 on a windows 2003 server under a cold failover clustered environment and was wondering... Is it recommended to have one web application deployed in it's own separate instance? For example, webapp1 deployed to instance1 and webapp2 deployed to instance2? Or would it be better to have multiple web applications deployed to one instance?
Thanks for any thoughts!user7575753 wrote:
I'm running OAS 10.1.2.2.0 on a windows 2003 server under a cold failover clustered environment and was wondering... Is it recommended to have one web application deployed in it's own separate instance? For example, webapp1 deployed to instance1 and webapp2 deployed to instance2? Or would it be better to have multiple web applications deployed to one instance?
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TIASimilar question was asked recently in our forum:
http://social.msdn.microsoft.com/Forums/en-US/18239da7-74f2-45a7-b984-15f1b3f27535/biztalk-clustering?forum=biztalkgeneral#4074a082-8459-420f-8e99-8bab19c8fba2
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thanks in advance, and best regardsuser7575753 wrote:
I'm running OAS 10.1.2.2.0 on a windows 2003 server under a cold failover clustered environment and was wondering... Is it recommended to have one web application deployed in it's own separate instance? For example, webapp1 deployed to instance1 and webapp2 deployed to instance2? Or would it be better to have multiple web applications deployed to one instance?
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10g in a Cold Failover Cluster
Hallo,
I have some doubts about configuration of a single instance in a two node cluster for a cold failover solution.
I mean,
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2 - to create a dbconsole, do I have to use ORACLE_HOSTNAME variable?
thanks in advanceEven if in Metalink note 362524.1,
a "failing over" db console need a shared home,
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Cold-Failover with Oracle Weblogic Server 10 R3
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It is possible to configure cold-failover using Oracle Weblogic Server?/
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ThanksHello All,
Have anybody configured auto server migration for cold failover?
I have a few questions regarding this setup, any help is much appreciated.
1. for the floating ips to work, do I need 2 NICS and two cables on each server?
2. Do I have to configure 2 different ips on one interface, which will be used as node manager listen address's for each of the 2 machines?
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Chandra -
TO setup Cold Failover in ESP Cluster
Hi,
I created two nodes (node1 and node2) and started in defferent machines, node1 in vewin764SA016(1st machine) and node2 in vewin764SA046(2nd machine)(I have attached both files).
I created an ESP project which has input window attached to XML Input Adapter.
I setup cluster configuration in CCR file as follows (I have attached CCR file also. I could not able to attach .ccr, so it change extension to txt):
<?xml version="1.0" encoding="UTF-8"?>
<Configuration xmlns="http://www.sybase.com/esp/project_config/2010/08/">
<Runtime>
<Clusters>
<Cluster name="esp://vewin764SA016:19011" type="remote">
<Auth>user</Auth>
<Username encrypted="false">sybase</Username>
<Password encrypted="false">sybase</Password>
<Rsakeyfile></Rsakeyfile>
<Managers>
<Manager>vewin764SA016:19001</Manager>
<Manager>vewin764SA046:19002</Manager>
</Managers>
</Cluster>
</Clusters>
<Bindings>
<Binding name="Battery_Life_Input_Adapter_window">
<Cluster>esp://vewin764SA016:19011</Cluster>
<Workspace>test</Workspace>
<Project>test</Project>
<BindingName>b1</BindingName>
<RemoteStream>remote1</RemoteStream>
<Output>false</Output>
</Binding>
</Bindings>
<AdaptersPropertySet>
<PropertySet name="Atom Feed Input">
<Property name="URL"></Property>
</PropertySet>
</AdaptersPropertySet>
</Runtime>
<Deployment>
<Project ha="false">
<Options>
<Option name="time-granularity" value="5"/>
<Option name="debug-level" value="4"/>
</Options>
<Instances>
<Instance>
<Failover enable="true">
<FailureInterval>120</FailureInterval>
<FailuresPerInterval>5</FailuresPerInterval>
</Failover>
<Affinities>
<Affinity charge="positive" strength="strong" type="controller" value="node1"/>
<Affinity charge="positive" strength="weak" type="controller" value="node2"/>
</Affinities>
<Affinities/>
</Instance>
</Instances>
</Project>
</Deployment>
</Configuration>
I added project to node1 using following command and started the project
esp_cluster_admin --uri=esp://vewin764SA016:19011 --username=sybase --password=sybase --add_project --project-name=test --workspace-name=test --ccx=test.ccx --ccr=test.ccr
Project started in both machines and both getting data.
As per ESP document: "If cold failover is enabled, a failover occurs when a failed project switches to another server to continue processing."
But in my case project is running in both the nodes and both getting data.
I tried all possible combinations for Affinity attributes charge and strength(positive/negative, strong/weak). But it did not work out.
How can I set up a cluster such that when i add a project, it should start running on one node and when that node goes down, it should bring up second node and start running on that.
Thanks
ShashiHi Shashi,
Reviewing the configuration of your ccr file, you've got
<Affinities>
<Affinity charge="positive" strength="strong" type="controller" value="node1"/>
<Affinity charge="positive" strength="weak" type="controller" value="node2"/>
</Affinities>
<Affinities/>
Just note, that in your set-up, you've set strong and positive for node1. This means that it will only run on node1.So if your node1 is down, the project will not start up on node2. Is that what you are trying to accomplish?
"</Affinities>" - that fifth line there is extra. I don't think it is harming anything though.
I am assuming that you are using Studio to see the that the "Project started in both machines and both getting data".
There is an outstanding New Feature Request CR for Studio to support HA and failover. Studio is really not compatible with HA. Studio makes it look like there are multiple instances of the project running when in fact there is only one instance running. Studio will start getting errors if the project crashes and is failed over to the secondary node. I can’t really recommend using Studio at all when dealing with HA:
CR 732974 - Request for Studio support of HA and failover.
To confirm that there is only one instance of the project running, I look at esp_cluster_admin:
$ esp_cluster_admin --uri esp://bryantpark:19011 --username=sybase
Password:
> get managers
Manager[0]: node1@http://bryantpark.sybase.com:19011
Manager[1]: node2@http://bryantpark.sybase.com:19012
> get controllers
Controller[0]: node1@http://bryantpark.sybase.com:19011
Controller[1]: node2@http://bryantpark.sybase.com:19012
> get projects
=============================
Workspace: test
Project: test
Instance Count: 1
----------- Instance Details -----------
Instance Name: default
Controller Name: node1
Current Status: started-running
Requested Status: started-running
Failure Interval: 120
Failures Per Interval: 5
-------------- Affinities --------------
Affinity Type: CONTROLLER
Affinity Charge: POSITIVE
Affinity Strength: STRONG
Affinity Subject: node1
Affinity Type: CONTROLLER
Affinity Charge: POSITIVE
Affinity Strength: WEAK
Affinity Subject: node2
>
The output from "get projects" shows that there are two active managers and controllers, and that the single instance is running from the controller named node1.
Next, I run the "get project" command, and it shows me the Pid:
> get project test/test
Workspace: test
Project: test
------------------ Instance : 0 ------------------
Instance Id: Id_2000003_1393600620713
Command Host: bryantpark.sybase.com
Command Port: 44905
Gateway Host: bryantpark.sybase.com
Gateway Port: 41162
Sql Port: 47244
SSL Enabled: false
Big Endian: false
Address Size: 8
Date Size: 8
Money Precision: 4
Pid: 20637
Topology Ignored: false
Timer Interval: 5
Active-Active: false
I run these Linux commands that also confirm to me that I have only one instance running:
$ ps -ef | grep esp_server
alices 19963 19961 1 09:45 pts/0 00:00:27 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-node node1.xml --cluster-log-properties node1.log.properties
alices 20243 20241 1 09:59 pts/1 00:00:15 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-node node2.xml --cluster-log-properties node2.log.properties
alices 20637 19963 0 10:16 ? 00:00:00 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-container --cluster-container-id Id_2000003_1393600620713 --log-to 4
alices 20729 18201 0 10:18 pts/2 00:00:00 grep esp_server
From here, I see that pid 20637's parent pid is 19963, which is the pid for node1 server.
Next, I kill the active manager and the project to simulate a catastrophic failure:
$ kill -9 20637 19963
Due to the affinities, no failover happens to node2:
$ ps -ef | grep esp_server
alices 20243 20241 1 09:59 pts/1 00:00:17 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-node node2.xml --cluster-log-properties node2.log.properties
alices 20764 18201 0 10:21 pts/2 00:00:00 grep esp_server
Next, I use a different ccr file that does not have affinities configured.
From esp_cluster_admin, I stop and remove the test/test project and then re-run using the modified ccr that has no affinities.
$ esp_cluster_admin --uri esp://bryantpark:19012\;bryantpark:19011 --username=sybase
Password:
> remove project test/test
[done]
> add project test/test bin/test.ccx test-without-affins.ccr
[done]
> start project test/test
[done]
> get projects
=============================
Workspace: test
Project: test
Instance Count: 1
----------- Instance Details -----------
Instance Name: default
Controller Name: node2
Current Status: started-running
Requested Status: started-running
Failure Interval: 120
Failures Per Interval: 5
This time, the project started on node2.
> get project test/test
Workspace: test
Project: test
------------------ Instance : 0 ------------------
Instance Id: Id_1000003_1393601774031
Command Host: bryantpark.sybase.com
Command Port: 46151
Gateway Host: bryantpark.sybase.com
Gateway Port: 36432
Sql Port: 50482
SSL Enabled: false
Big Endian: false
Address Size: 8
Date Size: 8
Money Precision: 4
Pid: 21422
Topology Ignored: false
Timer Interval: 5
Active-Active: false
>
The pid is 21422.
$ ps -ef | grep esp_server
alices 21213 21211 4 10:33 pts/0 00:00:07 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-node node1.xml --cluster-log-properties node1.log.properties
alices 21282 21280 4 10:33 pts/1 00:00:07 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-node node2.xml --cluster-log-properties node2.log.properties
alices 21422 21282 1 10:36 ? 00:00:00 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-container --cluster-container-id Id_1000003_1393601774031 --log-to 4
alices 21500 18201 0 10:36 pts/2 00:00:00 grep esp_server
Pid 21422's parent pid is 21282, which is the pid for node2 server.
Kill the project and node2:
$ kill -9 21422 21282
$ ps -ef | grep esp_server
alices 21213 21211 4 10:33 pts/0 00:00:08 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-node node1.xml --cluster-log-properties node1.log.properties
alices 21505 21213 12 10:36 ? 00:00:00 /work/alices/esp514/ESP-5_1/bin/esp_server --cluster-container --cluster-container-id Id_2_1393601813749 --log-to 4 --clus
alices 21578 18201 0 10:36 pts/2 00:00:00 grep esp_server
The project automatically fails over now to node1.
> get managers
Manager[0]: node1@http://bryantpark.sybase.com:19011
> get controllers
Controller[0]: node1@http://bryantpark.sybase.com:19011
> get projects
=============================
Workspace: test
Project: test
Instance Count: 1
----------- Instance Details -----------
Instance Name: default
Controller Name: node1
Current Status: started-running
Requested Status: started-running
Failure Interval: 120
Failures Per Interval: 5
Thanks,
Alice -
Installed RAC11gR2 on windows server, SCAN IP will failover and fallback if shutdown and then startup one of the nodes.
However, when i unplug the public network cable, the SCAN IP can failover but won't faillback when plug in the cable again. And then find that the SCAN VIP binded to public interface on both node. Seems it's needed to relocate the SCAN IP manually.
Is it the expected behaviour?As we all know scan IP is for client failover, my question is , if suppose by some network issue, if node1, node2 and node 3 shutdown immediate.
What will happen to the client failover under this case??
It depend what failover you is taking about.
SCAN failover - If you have a bad lucky for tree SCAN IP was running at node1,node2 and node3 the scan will failover to survive node and for a minute (time to failover and pmon register database on scan listener) the client wich try connect will get ORA-12541 TNS :no listener.
If at least one SCAN IP is not on node1,node2 or node3 at moment of failure then no ORA-* is raised.
Client Failover - The client does not use SCAN to keep a session or to failover, the client use VIP to hold connection at database, all client of node1,node2 and node3 will failover or not depending your client configuration (i.e depend of Network Configuration TAF enabled or not). -
Oracle11g r2 Grid/RAC VIP failover instead of SCAN VIP failover
Dear Experts and Gurus
Our Platform: 2-Node ORACLE11G r2 RAC/GRID 11.2.0.1.0
ReadHat Enterprise Linux5.3 64 bit
We have not available the DNS Server for used to SCAN feature of Oracle11g r2 GRID/RAC.
we have successfully deployed the the setup using scan-vip in /etc/host in our production site.
we want to used the Oracle11g r2 Grid/RAC as Oracle10g r2 RAC/Oracle11g r1 RAC(VIP Failover)
plz find the default configurations of my setup.
cat /etc/hosts
#public
xxx.xxx.0.1 xyz-ch-aaadb-01
xxx.xxx.0.2 xyzl-ch-aaadb-02
#Virtual
xxx.xxx.0.3 xyz-ch-aaadb-01-vip
xxx.xxx.0.4 xyz-ch-aaadb-02-vip
#Private
10.10.0.1 xyz-ch-aaadb-01-priv
10.10.0.2 xyz-ch-aaadb-01-priv
#Scan
xxx.xxx.0.5 rac-scan
cat listener.ora
listener.ora in both the RAC nodes
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
cat tnsnames.ora.
AAADB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = rac-scan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = aaadb)
aaadb2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = xyz-ch-aaadb-02-vip)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = aaadb)
(INSTANCE_NAME = aaadb2)
aaadb1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = xyz-ch-aaadb-01-vip)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = aaadb)
(INSTANCE_NAME = aaadb1)
listener parameters
RAC-NODE1
SQL> show parameter listener
NAME TYPE VALUE
listener_networks string
local_listener string (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=xyz-ch-aaadb-01-vip)(PORT=1521))))
remote_listener string rac-scan:1521
RAC-NODE2
SQL> show parameter listener
NAME TYPE VALUE
listener_networks string
local_listener string (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=xyz-ch-aaadb-02-vip)(PORT=1521))))
remote_listener string rac-scan:1521
listener status
RAC Node-1
[oracle@aaarac1 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 30-AUG-2011 23:43:50
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 30-AUG-2011 22:31:34
Uptime 0 days 1 hr. 12 min. 15 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/aaarac1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=xyz-ch-aaadb-01-vip)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=xxx.xxx.0.1)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "aaadb" has 1 instance(s).
Instance "aaadb1", status READY, has 1 handler(s) for this service...
Service "aaadbXDB" has 1 instance(s).
Instance "aaadb1", status READY, has 1 handler(s) for this service...
The command completed successfully
RAC Node-2
[oracle@aaarac2 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 30-AUG-2011 23:44:27
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date 30-AUG-2011 22:08:45
Uptime 0 days 1 hr. 35 min. 42 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/aaarac2/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=xyz-ch-aaadb-02-vip)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=xxx.xxx.0.2)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM2", status READY, has 1 handler(s) for this service...
Service "aaadb" has 1 instance(s).
Instance "aaadb2", status READY, has 1 handler(s) for this service...
Service "aaadbXDB" has 1 instance(s).
Instance "aaadb2", status READY, has 1 handler(s) for this service...
The command completed successfully
plz suggest the provide the step to configure the listener.ora and tnsnames.ora for use the Oracle11g r2 Grid/RAC to use as
VIP failover instead of SCAN-VIP failover.
Regards
Hitgon
Edited by: hitgon on Aug 31, 2011 12:14 AMhitgon wrote:
Dear Experts and Gurus
plz suggest the provide the step to configure the listener.ora and tnsnames.ora for use the Oracle11g r2 Grid/RAC to use as
VIP failover instead of SCAN-VIP failover.
Regards
Hitgon
Hi,
Have a read http://download.oracle.com/docs/cd/E11882_01/network.112/e10836/advcfg.htm#NETAG348
Hope it helps
CHeers -
How to deploy oracle 11g under cold failover cluster
Hi,
I am trying to install oracle 11g under failover cluster environments. I am trying to find some oracle documentation about it. But not able to find one. Can anyone help me. Please i need it badly.
we have two servers sun solaris 10. on which we have failover cluster being installed. one is active while one is passive. How can i install oracle 11g on this failover clusters. did i have to install oracle of shared SAN. what are the extra configuration i have to do please help
Also is it wise to install 11g warehouse with fail safe or use RAC.
regards
Nick
Edited by: Nick Naughty on Feb 1, 2009 4:02 AMthanks alot for reply.
I am of the same point of view. but the machine i am working on is sun solaris 10 with two partitions finance and accounts which have been protected by a failed over machine having two partitions finance and accounts and i think you are right these are the same shared storage folder which are mounted on active machine as well as on passive machine.
Now my question is if i install oracle 11g on one machine without oracle cluster then sun cluster should be able to mount the database in case the primary machine fails.
I have tried hard to get some documentation on this top but nothing so far. please help
regards
Nick -
Hi,
I need to build an active/passive cluster for an Oracle database. I'm using OEL 5 upd 3 64 bit and Oracle 11.1.0.7 for the database. I have a SAN so the database files will be shared by the two nodes. I do not have RAC for this environment (no license), hence the use of Linux HA and active/passive. Only one server should be able to access the database files at a time. Could you please advice how to accomplish the same.
ThanksHi Buddy,
Take a look in this note.
I need to build an active/passive cluster for an Oracle database. I'm using OEL 5 upd 3 64 bit and Oracle 11.1.0.7 for >the database. I have a SAN so the database files will be shared by the two nodes. I do not have RAC for this >environment (no license), hence the use of Linux HA and active/passive. Only one server should be able to access >the database files at a time. Could you please advice how to accomplish the same.You should verify that, but I guess You don't have to pay CRS license in order to protect single databases using CRS.
Hope it helps,
Cerreia -
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.SHi 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
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