Impact of having one SCAN listener down

GI version: 11.2.0.2
Platform : Solaris 10 (64 bit)
In our 2-node RAC, one among the 3 SCAN listeners is currently down due to a network misconfiguration.
This is a fairly busy production cluster. Since this is just a 2-node RAC, will there be any impact at all ?
I tried starting some SQL*Plus sessions from my desktop.
sqlplus scott/tiger@tnsEntryusingSCANIt takes just above 2 seconds to connect. It this slow? Maybe its just a co-incidence.

2 seconds connect time is definitely not fast, but within acceptable limit
3 SCANs are recommended for large busy clusters with several nodes
even 1 SCAN can serve a 2 node cluster perfectly

Similar Messages

  • Question related to SCAN Listener

    Hi All,
    Just need a clarification, Say for example we have 3 node RAC (3 SCAN IP's and 3 SCAN Listeners) each node contains one SCAN Listener. If any one the node is down automatically the SCAN IP and its Listener moved to the surviving nodes. My questions is which process is doing this work ? can you pls elobrate. Thanks !
    Regards
    Kamal

    Dear Kamal
    To detect a node failure, the Cluster Manager uses a background process—Global Enqueue Service Monitor (LMON)—to monitor the health of the cluster.
    When a node fails, the Cluster Manager reports the change in the cluster's membership to Global Cache Services (GCS) and Global Enqueue Service (GES).
    These services are then re-mastered based on the current membership of the cluster.
    ora.crsd
    CRSd - Cluster Ready Services     resource monitoring, failover and node recovery
    Regards
    Hitgon

  • Scan listener is NOT starting up

    Hi,
    I have installed 11gR2 two node RAC on OEL5.2, 64 bit.
    When ever I start the node, in one of the node SCAN listener will NOT be running.
    If I start the node one first then scan listener will run on node, if I start second node first then scan will run on second node.
    How many scan listener should run ( on both the nodes or only one nodes ) ??? Is it okay with one SCAN listener ???
    My /erc/hosts entry... I have configured ONLY one scan IP.
    ===================================================
    [oracle@rac1 sampleXMLs]$ cat /etc/hosts
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    127.0.0.1 localhost.localdomain localhost
    # Public Network - (eth0)
    192.168.1.8 rac1.appsdba.info rac1
    192.168.1.7 rac2.appsdba.info rac2
    # Private Interconnect - (eth1)
    192.168.0.100 rac1-priv.appsdba.info rac1-priv
    192.168.0.101 rac2-priv.appsdba.info rac2-priv
    # Public Virtual IP (VIP) addresses for - (eth0)
    192.168.1.200 rac1-vip.appsdba.info rac1-vip
    192.168.1.201 rac2-vip.appsdba.info rac2-vip
    # Scan IP
    192.168.1.187 racnode-cluster-scan
    ===================================================
    Thanks.
    -joy.

    If I start the node one first then scan listener will run on node, if I start second node first then scan will run on second node.in your case ,the above result is expected.
    My /erc/hosts entry... I have configured ONLY one scan IP.
    192.168.1.187 racnode-cluster-scanActually this is not a way to configure the scan, please refer the below document.
    normally we've 3 scan ip configured for SCAN.
    http://www.oracle.com/technetwork/database/clustering/overview/scan-129069.pdf

  • Adding new scan listener

    Hi
    when i installed 11.2 rac, I only had one ip assigned to the scan in dns, so I have ended up with one scan listener listener_scan1
    i have allocated second ip to the scan name in dns but struggling to get the second scan listener up and running.
    srvctl config scan
    SCAN VIP name: scan1, IP: /*****/****
    SCAN VIP name: scan2, IP: /*****/****
    i have also manually added entry to $grid_homenetwork/admin/listener.ora
    LISTENER_SCAN2=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2)))) # line added by Agent
    ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN2=ON # line added by Agent
    do i need to make any other changes?

    Levi Pereira wrote:
    Hi,
    i have also manually added entry to $grid_homenetwork/admin/listener.oraDid you use this command create new scan_listener?
    srvctl add scan_listener
    Regards,
    Levi Pereirathe command initially failed wth error saying scan listener already exists...I fixed the issue by stopping the listener_scan1 , doing srvctl remove to remove scan listener then did srvctl add scan.... which created 2 listeners this time and all working ... i guess srvctl checks the dns and creates as many as listeners as required ( depending on number of ip's configured in dns)
    thanks anyway

  • 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

  • SCAN LISTENER runs from only one node at a time from /etc/hosts !

    Dear all ,
    Recently I have to configure RAC in oracle 11g(r2) in AIX 6.1 . Since in this moment it is not possible to configure DNS, so I dont use SCAN ip into the DNS/GNS, I just add the SCAN ip into the host file like :
    cat /etc/hosts
    SCAN 172.17.0.22
    Got the info from : http://www.freeoraclehelp.com/2011/12/scan-setup-for-oracle-11g-release211gr2.html#ORACLE11GR2RACINS
    After configuring all the steps of RAC , Every services are ok except SCAN_LISTENER . This listener is up only one node at a time . First time when I chek it from node1 , it shows :
    srvctl status scan_listener
    SCAN listener LISTENER_SCAN1 is enabled
    SCAN listener LISTENER_SCAN1 is running on node dcdbsvr1
    now when I relocate it from node 2 using
    "srvctl relocate scan -i 1-n DCDBSVR2" , then the output shows :
    srvctl status scan_listener
    SCAN listener LISTENER_SCAN1 is enabled
    SCAN listener LISTENER_SCAN1 is running on node dcdbsvr2
    Baring these , we have to try to relocate it from the node2 by the following way, then it shows the error :
    srvctl relocate scan -i 2 -n DCDBSVR2
    resource ora.scan2.vip does not exists
    Now my question , How can I run the SCAN and SCAN_LISTENER both of the NODES ?
    Here is my listener file (which is in the GRID home location) configuration :
    Listener File OF NODE1 AND NODE 2:
    ==================================
    ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1=ON
    ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER=ON
    LISTENER_SCAN1 =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = IPC) (KEY = LISTENER_SCAN1)
    ADR_BASE_LISTENER_SCAN1 = /U01/APP/ORACLE
    2)
    Another issue , when I give the command : " ifconfig -a " , then it shows the SCAN ip either node1 or node2 . suppose if the SCAN ip is in the node1 , and then if I run the "relocate" command from node2 , the ip goes to the Node 2 . is it a correct situation ? advice plz ... ...
    thx in advance .. ...
    Edited by: shipon_97 on Jan 10, 2012 7:22 AM
    Edited by: shipon_97 on Jan 10, 2012 7:31 AM

    After configuring all the steps of RAC , Every services are ok except SCAN_LISTENER . This listener is up only one node at a time . First time when I chek it from node1 , it shows :If I am not wrong and after looking at the document you sent, you will be able to use only once scan in case you use /etc/host file and this will be up on only one node where you added this scan entry in /etc/hosts file.
    Now my question , How can I run the SCAN and SCAN_LISTENER both of the NODES ?Probably you can't in your case, you might run only one i think and on one node only
    srvctl status scan_listener
    SCAN listener LISTENER_SCAN1 is enabled
    SCAN listener LISTENER_SCAN1 is running on node dcdbsvr1
    now when I relocate it from node 2 using
    "srvctl relocate scan -i 1 -n DCDBSVR2" , then the output shows :
    srvctl status scan_listener
    SCAN listener LISTENER_SCAN1 is enabled
    SCAN listener LISTENER_SCAN1 is running on node dcdbsvr2You moved scan listener from node 1 to node 2, OK
    Baring these , we have to try to relocate it from the node2 by the following way, then it shows the error :
    srvctl relocate scan -i 2 -n DCDBSVR2
    resource ora.scan2.vip does not exists
    --------------------------------------------------------------------------------Since you have only one scan, you can't relocate "2". So ise "1" instead here also
    FYI
    http://www.oracle.com/technetwork/database/clustering/overview/scan-129069.pdf
    Salman

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  • Oracle SCAN Listener Status change

    Hi,
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    Thanks for the information.
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  • Any additional configuration require to achieve TAF in 11.2.0.4 RAC along with scan listener

    Hi
    We have 2 node RAC database of version 11.2.0.4 running on Linux platform.
    There are 2 SCAN listener running on DB instead of 3 which usually recommenced by oracle.
    When one of instance brought down as scheduled activity, sessions which connected to same instance, received ORA-03113: end-of-file on communication channel.
    They were doing some select activity in db.
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  • WHY: Scan VIP does failover, but Scan Listener does not!

    Hi,
    I have a two node cluster based on 11.2.0.4 (no patches yet). When one node is down, the scan vip does failover to the other node, but however the scan listener does not:
    All up and running:
    [oracle@rzsolv236 ~]$ crsctl stat res -t
    NAME           TARGET  STATE        SERVER                   STATE_DETAILS
    Local Resources
    ora.DG_GRID.dg
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.LISTENER.lsnr
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.asm
                   ONLINE  ONLINE       rzsolv236                Started
                   ONLINE  ONLINE       rzsolv237                Started
    ora.gsd
                   OFFLINE OFFLINE      rzsolv236
                   OFFLINE OFFLINE      rzsolv237
    ora.net1.network
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.ons
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.registry.acfs
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    Cluster Resources
    ora.LISTENER_SCAN1.lsnr
          1        ONLINE  ONLINE       rzsolv236
    ora.LISTENER_SCAN2.lsnr
          1        ONLINE  ONLINE       rzsolv237
    ora.cvu
          1        ONLINE  ONLINE       rzsolv236
    ora.oc4j
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv236.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv237.vip
          1        ONLINE  ONLINE       rzsolv237
    ora.scan1.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.scan2.vip
          1        ONLINE  ONLINE       rzsolv237
    One node is down:
    [oracle@rzsolv236 bin]# ./crsctl stat res -t
    NAME           TARGET  STATE        SERVER                   STATE_DETAILS
    Local Resources
    ora.DG_GRID.dg
                   ONLINE  ONLINE       rzsolv236
    ora.LISTENER.lsnr
                   ONLINE  ONLINE       rzsolv236
    ora.asm
                   ONLINE  ONLINE       rzsolv236                Started
    ora.gsd
                   OFFLINE OFFLINE      rzsolv236
    ora.net1.network
                   ONLINE  ONLINE       rzsolv236
    ora.ons
                   ONLINE  ONLINE       rzsolv236
    ora.registry.acfs
                   ONLINE  ONLINE       rzsolv236
    Cluster Resources
    ora.LISTENER_SCAN1.lsnr
          1        ONLINE  ONLINE       rzsolv236
    ora.LISTENER_SCAN2.lsnr
          1        ONLINE  OFFLINE
    ora.cvu
          1        ONLINE  ONLINE       rzsolv236
    ora.oc4j
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv236.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv237.vip
          1        ONLINE  INTERMEDIATE rzsolv236                FAILED OVER
    ora.scan1.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.scan2.vip
          1        ONLINE  INTERMEDIATE rzsolv236                FAILED OVER
    It is the same with manual relocate, for the scan vip only it works:
    [oracle@rzsolv236 ~]$ srvctl relocate scan -i 2 -n rzsolv236
    [oracle@rzsolv236 ~]$ crsctl stat res -t
    NAME           TARGET  STATE        SERVER                   STATE_DETAILS
    Local Resources
    ora.DG_GRID.dg
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.LISTENER.lsnr
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.asm
                   ONLINE  ONLINE       rzsolv236                Started
                   ONLINE  ONLINE       rzsolv237                Started
    ora.gsd
                   OFFLINE OFFLINE      rzsolv236
                   OFFLINE OFFLINE      rzsolv237
    ora.net1.network
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.ons
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.registry.acfs
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    Cluster Resources
    ora.LISTENER_SCAN1.lsnr
          1        ONLINE  ONLINE       rzsolv236
    ora.LISTENER_SCAN2.lsnr
          1        ONLINE  OFFLINE
    ora.cvu
          1        ONLINE  ONLINE       rzsolv236
    ora.oc4j
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv236.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv237.vip
          1        ONLINE  ONLINE       rzsolv237
    ora.scan1.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.scan2.vip
          1        ONLINE  INTERMEDIATE rzsolv236                FAILED OVER
    [oracle@rzsolv236 ~]$ srvctl relocate scan -i 2 -n rzsolv237
    [oracle@rzsolv236 ~]$ crsctl stat res -t
    NAME           TARGET  STATE        SERVER                   STATE_DETAILS
    Local Resources
    ora.DG_GRID.dg
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.LISTENER.lsnr
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.asm
                   ONLINE  ONLINE       rzsolv236                Started
                   ONLINE  ONLINE       rzsolv237                Started
    ora.gsd
                   OFFLINE OFFLINE      rzsolv236
                   OFFLINE OFFLINE      rzsolv237
    ora.net1.network
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.ons
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    ora.registry.acfs
                   ONLINE  ONLINE       rzsolv236
                   ONLINE  ONLINE       rzsolv237
    Cluster Resources
    ora.LISTENER_SCAN1.lsnr
          1        ONLINE  ONLINE       rzsolv236
    ora.LISTENER_SCAN2.lsnr
          1        ONLINE  ONLINE       rzsolv237
    ora.cvu
          1        ONLINE  ONLINE       rzsolv236
    ora.oc4j
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv236.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv237.vip
          1        ONLINE  ONLINE       rzsolv237
    ora.scan1.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.scan2.vip
          1        ONLINE  ONLINE       rzsolv237
    [oracle@rzsolv236 ~]$
    But it does not for the scan listener:
    [oracle@rzsolv236 ~]$ srvctl relocate scan_listener -i 2 -n rzsolv236
    PRCR-1105 : Failed to relocate resource ora.LISTENER_SCAN2.lsnr to node rzsolv236
    PRCR-1089 : Failed to relocate resource ora.LISTENER_SCAN2.lsnr.
    CRS-2674: Starten von "ora.scan2.vip" auf "rzsolv236" nicht erfolgreich
    [oracle@rzsolv236 ~]$ srvctl relocate scan -i 2 -n rzsolv236
    [oracle@rzsolv236 ~]$ srvctl relocate scan_listener -i 2 -n rzsolv236
    PRCR-1090 : Failed to relocate resource ora.LISTENER_SCAN2.lsnr. It is not running.
    [oracle@rzsolv236 ~]$
    Any ideas?
    Robert

    Hi,
    thank you, but this does not match to my problem:
    - those socket files are owned by oracle:oinstall on both nodes, I deleted them to give it a try but no change
    - I can start the LISTENER_SCAN2 on node 1 using lsnrctl when node 2 is down, but I cannot using crsctl and GI does not check it when I start the listener manually
    - GI seems to be kind of confused about the state of the LISTENER_SCAN2 while node 2 is down (is already in the INTERMEDIATE state on server 'rzsolv236' vs. OFFLINE state in crsctl stat res -t)
    see output below ...
    [oracle@rzsolv236 ~]$ crsctl stat res -t
    NAME           TARGET  STATE        SERVER                   STATE_DETAILS
    Local Resources
    ora.DG_GRID.dg
                   ONLINE  ONLINE       rzsolv236
    ora.LISTENER.lsnr
                   ONLINE  ONLINE       rzsolv236
    ora.asm
                   ONLINE  ONLINE       rzsolv236                Started
    ora.gsd
                   OFFLINE OFFLINE      rzsolv236
    ora.net1.network
                   ONLINE  ONLINE       rzsolv236
    ora.ons
                   ONLINE  ONLINE       rzsolv236
    ora.registry.acfs
                   ONLINE  ONLINE       rzsolv236
    Cluster Resources
    ora.LISTENER_SCAN1.lsnr
          1        ONLINE  ONLINE       rzsolv236
    ora.LISTENER_SCAN2.lsnr
          1        ONLINE  OFFLINE
    ora.cvu
          1        ONLINE  ONLINE       rzsolv236
    ora.oc4j
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv236.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.rzsolv237.vip
          1        ONLINE  INTERMEDIATE rzsolv236                FAILED OVER
    ora.scan1.vip
          1        ONLINE  ONLINE       rzsolv236
    ora.scan2.vip
          1        ONLINE  INTERMEDIATE rzsolv236                FAILED OVER
    [oracle@rzsolv236 ~]$
    [oracle@rzsolv236 ~]$ crsctl start res ora.LISTENER_SCAN2.lsnr -n rzsolv23
    CRS-2800: Cannot start resource 'ora.scan2.vip' as it is already in the INTERMEDIATE state on server 'rzsolv236'
    CRS-4000: Command Start failed, or completed with errors.
    [oracle@rzsolv236 ~]$
    [oracle@rzsolv236 ~]$ lsnrctl status LISTENER_SCAN2
    LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 28-NOV-2013 16:12:15
    Copyright (c) 1991, 2013, Oracle.  All rights reserved.
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2)))
    TNS-12541: TNS:no listener
    TNS-12560: TNS:protocol adapter error
      TNS-00511: No listener
       Linux Error: 2: No such file or directory
    [oracle@rzsolv236 ~]$
    [oracle@rzsolv236 ~]$ lsnrctl start LISTENER_SCAN2
    LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 28-NOV-2013 16:12:32
    Copyright (c) 1991, 2013, Oracle.  All rights reserved.
    Starting /ora01/app/grid/product/GRID_11.2.0.4/bin/tnslsnr: please wait...
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    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER_SCAN2)))
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    ora.rzsolv236.vip
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    ora.scan2.vip
          1        ONLINE  INTERMEDIATE rzsolv236                FAILED OVER
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    Regards,
    Robert

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    Start Date                30-APR-2015 11:43:24
    Uptime                    0 days 0 hr. 1 min. 53 sec
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    Output:
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    # TNSNAMES.ORA
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    RnRMusicMan
    I work on behalf of HP
    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" to say “Thanks” for helping!

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