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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    Manager[1]:     node2@http://bryantpark.sybase.com:19012
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    Controller[0]:  node1@http://bryantpark.sybase.com:19011
    Controller[1]:  node2@http://bryantpark.sybase.com:19012
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    =============================
    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
    >
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    Project:                      test
        ------------------ Instance : 0 ------------------
        Instance Id:                  Id_2000003_1393600620713
        Command Host:                 bryantpark.sybase.com
        Command Port:                 44905
        Gateway Host:                 bryantpark.sybase.com
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        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
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    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
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    $ 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.
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    > 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
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    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
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    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:
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    $ 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

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    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)))
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    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 AM

    hitgon 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

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    Edited by: Nick Naughty on Feb 1, 2009 4:02 AM

    thanks alot for reply.
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    Hi,
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    RDBMS:   Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
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    When I tried with SRCVTL STOP LISTENER , I thought the SCAN LISTENER adn SCAN IP will failover, but it did not?
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    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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