Multiple listeners on a RAC cluster?

Hello -
I have a RAC cluster that will contain between 5 and 10 databases. Would it be a best practice to have a separate listener for each database, or one listener for the entire cluster?
Thanks,
mike

I do not think one listener would work in my situation, please comment.
I have two and three node RACs running multiple installations of E-Business Suite, each installation is owned by a different userid with primary group dba.
Autoconfig does not seem aware of the concept of a single listener; an execution of autoconfig is only aware of it's current context and so will generate a single listener.ora and tnsnames.ora.
Thanks for your insights.
Jerry

Similar Messages

Question about multiple listeners and vip addresses in rac.

We have a 2 node rac cluster running 10.2.0.3 on rhel4 on the itanium platform. We have a need where we want to connect the 2 hosts up to another network temporarily by configuring an additional network interface on each server so that we can test some connections from a different network.
My question is can you configure multiple listeners on the same server in which the newly added listener can be configured to service requets on the new network interface?
Because it's rac would you need to configure an additional vip address? I am not sure that you can have multiple vip's on a server?
Has anyone configured rac in such a way, any help is appreciated.

can you configure multiple listeners on the same server in which the newly added listener can be configured to service requets on the new network interface?Yes, you can but you should not be doing this. Listener is a node specific resource and one listener can server multiple services. You actually can create multiple services within the database for different set of users and all can be registered to the same listener.
Because it's rac would you need to configure an additional vip address? What do you mean by additional IP?
You have installed 10g RAC where you have already configured virtual IPs. Why do you want to have additional one? node1 - static ip1, vip1, pvtip1
node2 - static ip2 vip2, pvtip2
total 6
I am not sure that you can have multiple vip's on a server?Nothing to do with the server, they are based on public IP. Yes you can create multiples vip's based on same public IP. This is possible, But you do not need to do this in RAC environment.

Multiple databases in one single RAC cluster

Hi, I would like to know if one can have multiple databases running on a single RAC cluster, we have several databases in our shop and would like to consolidate all of them into a single 3-4 node RAC cluster running databases with 10.2 and 11.1 versions.
I am newbie to RAC and would like to get some clarification if anyone has done this, google search comes up with few hits on this topic, so obviously this is not doable.
In our case we have one database supporting critical applications and few other not so critical but are used very extensively between 9-5, so what is the use of RAC if I cannot consolidate all my databases into one cluster, or if I need a separate cluster for each of these critical databases?
I have been all the Oracle docs that keep repeating one database multiple instances and one instance-one machine-one node, they don't even advise running multiple instances on a single node?.
I appreciate any insight.
Thanks.

ora-sql-dba wrote:
Can you give more details on how you would setup multiple databases running different versions on a single RAC cluster, I am yet to find any documentation that supports or even elaborates on this topic.You can configure a cluster with 12 nodes. Then, using dbca, configure a dev instance for nodes 1 and 2, a prod1 instance for nodes 3 to 6 and a prod2 instance for nodes 7 to 12.
You also can configure each of these instances for all 12 nodes. And use it on all 12 nodes.
Or, after configuring it for all 12 nodes, you can start the dev instance on nodes 1 and 2, prod1 on 3 - 6 and prod2 on the remaining nodes. If dev needs more power, you can for example shutdown prod2 on node 12 and start another dev instance there.
My issue is with the 2nd option - running more than one instance on the same node or server. Why? Each instance has a basic resource footprint ito shared memory needed, system processes required (like db writer, log writer, sys monitor) etc. It does not make sense to pay for that same footprint more than once on a server. Each time you do, you need to reduce the amount of resources that can be used by each instance.
So instead of using (for example) 60% of that server's memory as the SGA for a single instance, if you use 2 instances on that server you now have to reduce the SGA of each to 30% of system memory. Effectively crippling those instances by 50% - they will now have smaller buffer caches, require more physical I/O and be more limited in what they can do.
So unless you have very sound technical reasons for running more than one instance on a server (RAC or non-RAC), do not.

Multiple databases/instances on 4-node RAC Cluster including Physical Stand

OS: Windows 2003 Server R2 X64
DB: 10.2.0.4
Virtualization: NONE
Node Configuration: x64 architecture - 4-Socket Quad-Core (16 CPUs)
Node Memory: 128GB RAM
We are planning the following on the above-mentioned 4-node RAC cluster:
Node 1: DB1 with instanceDB11 (Active-Active: Load-balancing & Failover)
Node 2: DB1 with instanceDB12 (Active-Active: Load-balancing & Failover)
Node 3: DB1 with instanceDB13 (Active-Passive: Failover only) + DB2 with instanceDB21 (Active-Active: Load-balancing & Failover) + DB3 with instanceDB31 (Active-Active: Load-balancing & Failover) + DB4 with instance41 (Active-Active: Load-balancing & Failover)
Node 4: DB1 with instanceDB14 (Active-Passive: Failover only) + DB2 with instanceDB22 (Active-Active: Load-balancing & Failover) + DB3 with instanceDB32 (Active-Active: Load-balancing & Failover) + DB4 with instance42 (Active-Active: Load-balancing & Failover)
Note: DB1 will be the physical primary PROD OLTP database and will be open in READ-WRITE mode 24x7x365.
Note: DB2 will be a Physical Standby of DB1 and will be open in Read-Only mode for reporting purposes during the day-time, except for 3 hours at night when it will apply the logs.
Note: DB3 will be a Physical Standby of a remote database DB4 (not part of this cluster) and will be mounted in Managed Recovery mode for automatic failover/switchover purposes.
Note: DB4 will be the physical primary Data Warehouse DB.
Note: Going to 11g is NOT an option.
Note: Data Guard broker will be used across the board.
Please answer/advise of the following:
1. Is the above configuration supported and why so? If not, what are the alternatives?
2. Is the above configuration recommended and why so? If not, what are the recommended alternatives?

Hi,
As far as i understand, there's nothing wrong in configuration except you need to consider below points while implementing final design.
1. No of CPU on each servers
2. Memory on each servers
3. If you've RAC physical standby then apply(MRP0) will run on only one instance.
4. Since you are configuring physical standby for on 3rd and 4th nodes of DB1 4 node cluster where DB13 and DB14 instances are used only for failver, if you've a disaster at data center or power failure in entire data center, you are losing both primary and secondary with an assumption that your primary and physical standby reside in same data center so it may not be highly available architecture. If you are going to use extended RAC for this configuration then it makes sense where Node 1 and Node 2 will reside in Datacenter A and Node 3 ,4 will reside in Datacenter B.
Thanks,
Keyur

JVM patch required for DST on 10.2.0.2 RAC cluster

I have looked all over the internet and Metalink for information regarding the JVM patching on a RAC cluster and haven't found anything useful, so I apologize if this question has already been asked multiple times. Also if there is a forum dedicated to DST issues, please point me in that direction.
I have a 10.2.0.2 RAC cluster so I know I have to do the JVM patching required because of the DST changes. The README for 5075470 says to follow post-implementation steps in the fix5075470README.txt file. Step 3 of those instructions say to bounce the database, and then not allow the use of java until step 4 is complete (which is to run the fix5075470b.sql script).
Here's my question: since this is a RAC database, does that mean I have to shutdown both instances, start them back up, run the script, and then let users log back in? IN OTHER WORDS, AN OUTAGE IS REQUIRED?
Is there a way around having to take an outage? Can I bounce each instance separately (in a rolling fashion) so there's no outage, and then run the script even though users are logged on if I think java isn't being used by the application? Is there a way to confirm whether or not it's being used? If I confirm the application isn't using java, is it ok to run the script while users are logged on?
Any insight would be greatly appreciated.
Thanks,
Susan

According to Note: 414309.1 USA 2007 DST Changes: Frequently Asked Questions an Problem for Oracle JVM Patches, question 4 Does the database need to be down before the OVJM patch is applied, the bounce is necessary. That says nothing about a rolling upgrade in RAC.
You might file an SR asking if a rolling upgrade is possible.

Is there a way to config WLS to fail over from a primary RAC cluster to a DR RAC cluster?

Here's the situation:
We have two Oracle RAC clusters, one in a primary site, and the other in a DR site
Although they run active/active using some sort of replication (Oracle Streams? not sure), we are being asked to use only the one currently being used as the primary to prevent latency & conflict issues
We are using this only for read-only queries.
We are not concerned with XA
We're using WebLogic 10.3.5 with MultiDatasources, using the Oracle Thin driver (non-XA for this use case) for instances
I know how to set up MultiDatasources for an individual RAC cluster, and I have been doing that for years.
Question:
Is there a way to configure MultiDatasources (mDS) in WebLogic to allow for automatic failover between the two clusters, or does the app have to be coded to failover from an mDS that's not working to one that's working (with preference to a currently labelled "primary" site).
Note:
We still want to have load balancing across the current "primary" cluster's members
Is there a "best practice" here?

Hi Steve,
There are 2 ways to connect WLS to a Oracle RAC.
1. Use the Oracle RAC service URL which contains the details of all the RAC nodes and the respective IP address and DNS.
2. Connect to the primary cluster as you are currently doing and use a MDS to load-balance/failover between multiple nodes in the primary RAC (if applicable).
In case of a primary RAC nodes failure and switch to DR RAC nodes, use WLST scripts to change the connection URL and restart the application to remove any old connections.
Such DB fail-over tests can be conducted in a test/reference environment to set up the required log monitoring and subsequent steps to measure the timelines.
Thanks,
Souvik.

Routing all connections through a one node in a 2 node RAC cluster

Hi everyone
My client has the following requirement: an active/active RAC cluster (eg node1/node2), but with only one of the nodes being used (node1) and the other sitting there just in case.
For things like services, i'm sure this is straightforward enough - just have them set to preferred on node1 and available on node 2.
For connections, I imagine I would just have the vips in order in the tns file, but with LOAD_BALANCING=OFF, so they go through the tns entries in order (i.e node 1, then node 2), so this would still allow the vip to failover if node 1 is down.
Does that sound about right? Have I missed anything?
Many thanks
Rup

user573914 wrote:
My client has the following requirement: an active/active RAC cluster (eg node1/node2), but with only one of the nodes being used (node1) and the other sitting there just in case.Why? What is the reason for a "+just in case+" node - and when and how is is "enabled" when that just-in-case situation occurs?
This does not many any kind of sense from a high availability or redundancy view.
For connections, I imagine I would just have the vips in order in the tns file, but with LOAD_BALANCING=OFF, so they go through the tns entries in order (i.e node 1, then node 2), so this would still allow the vip to failover if node 1 is down.
Does that sound about right? Have I missed anything?Won't work on 10g - may not work on 11g. The Listener can and does handoff connections, depending on what the TNS connection string say. If you do not connect via a SID entry but via a SERVICE entry, and that service is available on multiple nodes, you may not (and often will not) be connected to instance on the single IP that you used in your TNS connection.
Basic example:
// note that this TEST-RAC alias refers to a single specific IP of a cluster, and use
// SERVICE_NAME as the request
/home/billy> tnsping test-rac
TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 18-JAN-2011 09:06:33
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/network/admin/sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS=(PROTOCOL=TCP)(HOST= 196.1.83.116)(PORT=1521)) (LOAD_BALANCE=no) (CONNECT_DATA=(SERVER=shared)(SERVICE_NAME=myservicename)))
OK (50 msec)
// now connecting to the cluster using this TEST-RAC TNS alias - and despite we listing a single
// IP in our TNS connection, we are handed off to a different RAC node (as the service is available
// on all nodes)
// and this also happens despite our TNS connection explicitly requesting no load balancing
/home/billy> sqlplus scott/tiger@test-rac
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Jan 18 09:06:38 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Data Mining and Real Application Testing options
SQL> !lsof -n -p $PPID | grep TCP
sqlplus 5432 billy 8u IPv4 2199967 0t0 TCP 10.251.93.58:33220->196.1.83.127:37031 (ESTABLISHED)
SQL> So we connected to RAC node 196.1.83.116 - and that listener handed us off to RAC node 196.1.83.127. The 11gr2 Listener seems to behave differently - it does not do a handoff (from a quick test I did on a 11.2.0.1 RAC) in the above scenario.
This issue aside - how do you deal with just-in-case situation? How do you get clients to connect to node 2 when node 1 is down? Do you rely on the virtual IP of node 1 to be switched to node 2? Is this a 100% safe and guaranteed method?
It can take some time (minutes, perhaps more) for a virtual IP address to fail over to another node. During that time, any client connection using that virtual IP will fail. Is this acceptable?
I dunno - I dislike this concept of your client of treating the one RAC node as some kind of standby database for a just-in-case situation. I fail to see any logic in that approach.

Why do we use reverse proxy for Oracle RAC Cluster setup

Hello All,
I got this question lately.. "why do we use reverse proxy for Oracle RAC Cluster setup". I know we use the reverse proxy at Middleware level for multiple security reasons.
Thanks..

"why do we use reverse proxy for Oracle RAC Cluster setup".
I wouldn't. I wouldn't use a proxy of any sort for the Cluster Interconnect for sure.
Cheers,
Brian

ASM Silent Installation on RAC Cluster

Hello -
I am performing a silent install of the ASM software on my RAC cluster. After my install, I notice that the listener has been configured in the ASM home, and I do not want it to be configured. I want to configure it later in the rdbms home. Here is my response file for the silent ASM install:
RESPONSEFILE_VERSION=2.2.1.0.0
UNIX_GROUP_NAME="oinstall"
FROM_LOCATION="/oracle_software/11g_database/database/stage/products.xml"
NEXT_SESSION_RESPONSE=<Value Unspecified>
ORACLE_BASE="/opt/app/oracle/product/11g"
INVENTORY_LOCATION="/opt/app/oracle/product/11g/oraInventory"
ORACLE_HOME="/opt/app/oracle/product/11g/asm_1"
ORACLE_HOME_NAME="OraASM11g_home1"
TOPLEVEL_COMPONENT={"oracle.server","11.1.0.6.0"}
DEINSTALL_LIST={"oracle.server","11.1.0.6.0"}
SHOW_SPLASH_SCREEN=false
SHOW_WELCOME_PAGE=false
SHOW_NODE_SELECTION_PAGE=false
SHOW_SUMMARY_PAGE=false
SHOW_CUSTOM_TREE_PAGE=false
SHOW_INSTALL_PROGRESS_PAGE=false
SHOW_CONFIG_TOOL_PAGE=false
SHOW_XML_PREREQ_PAGE=false
SHOW_ROOTSH_CONFIRMATION=false
SHOW_END_SESSION_PAGE=false
SHOW_EXIT_CONFIRMATION=false
NEXT_SESSION=false
NEXT_SESSION_ON_FAIL=false
SHOW_DEINSTALL_CONFIRMATION=false
SHOW_DEINSTALL_PROGRESS=false
RESTART_SYSTEM=<Value Unspecified>
RESTART_REMOTE_SYSTEM=<Value Unspecified>
REMOVE_HOMES=<Value Unspecified>
ORACLE_HOSTNAME=<Value Unspecified>
SHOW_END_OF_INSTALL_MSGS=false
CLUSTER_NODES={"ctolinuxpoc01","ctolinuxpoc02"}
COMPONENT_LANGUAGES={"en"}
INSTALL_TYPE="Custom"
oracle.server:DEPENDENCY_LIST={"oracle.rdbms:11.1.0.6.0","oracle.options:11.1.0.6.0","oracle.sysman.console.db:11.1.0.5.0","oracle.rdbms.oci:11.1.0.6.0","oracle.precomp:11.1.0.6.0","oracle.xdk:11.1.0.6.0","oracle.sqlplus.isqlplus:11.1.0.6.0","oracle.odbc:11.1.0.6.0"}
s_nameForDBAGrp="dba"
s_nameForOPERGrp="dba"
What can I include or exclude so netca won't get automatically run?
Thanks in advance!
Mike

How can I change the RAC configuration in the installation so the listener is not created using the ASM instance? When I run the GUI, and don't select any Oracle NET services to be installed, then the listeners are not created. However, if I then record a response file, the listener is then created. Here is an excerpt from the recorded response file:
oracle.server:DEPENDENCY_LIST={"oracle.rdbms:11.1.0.6.0","oracle.options:11.1.0.6.0","oracle.rdbms.oci:11.1.0.6.0","oracle.precomp:11.1.0.6.0","oracle.xdk:11.1.0.6.0"}
#Name : DEPENDENCY_LIST
#Datatype : StringList
#Description: List of dependees that need to be installed along with this product.
#Component : oracle.network
oracle.network:DEPENDENCY_LIST={"oracle.network.listener:11.1.0.6.0"}
I need to get this completely automated, so I want to get the listener configured when I install the RDBMS software. Any assistance is greatly appreciated!
Thanks in adavance!
Mike

Theoretical question on having "stand by" instance on 4 node RAC cluster.

We have been having discussions on how we can improve the overall stability and performance of our RAC cluster. Currently we are running multiple databases on a 2 node cluster. The idea is that we will add two more nodes to the cluster and then spread the instances across the 4 nodes but only have two active and 1 as a standby in the event of node failure.
In other words:
Node1, Node2, and Node3 would run DB1
Node 4 Node3 and Node2 would run DB2
Additionally DB1_Instance3 would be shutdown on Node3 and only started if Node1 or 2 failed.
This would be the same for DB2 where DB2_Instance3 on Node2 would only be started if Node3 or Node4 failed.
Underneath them all would be the same ASM database shared for all 4 nodes.
Has anyone seen such a configuration? Is anyone aware of a white paper that discusses it.

the parameter active_instance_count is a 9i parameter and should only be set if you want to run RAC with a 2 node cluster - one instance active (all users connected here) and the second instance up but no one actively using it. IF instance one goes away, all work is move to instance 2. This is hot failover .
If you are adding a new instance to a rac database, you are recommended to use DBCA or EM to add the instance. If you do not want to have users connected to the instance all the time, you can either leave it running but do not enable any services on it until you need it or stop the instance with srvctl stop instance. The cluster will not try to restart the instance automatically.
The services option, when you create a service, you define which instances you wish it to run on. You can dynamically change where it runs. For the end user, they just connect to the service, the listener directs the connection to the least loaded instance providing the service at connect time. See the workload management with RAC 10g white paper on otn (otn.oracle.com/rac) or Chapter 6 of admin & deploy guide

How to configure multiple listeners to listen for the same instance.

Hello everyone,
I am running oracle database 11g and I want information regarding how to configure multiple listeners to listen for the same database instance. Actually I know how to configure more than one listener but the main thing that I am confused about is when we create listener.ora file, do we have to statically register the database instance with both the listeners or the instance will register itself with both the listeners.
According to my knowledge the instance will register with the listener specified by LOCAL_LISTENER parameter and we cannot have more than one value for this parameter.
Please only give detailed answers with example as I am tired of simple answers with details that I already know.

Hello,
Yes, it can make sense to have several listener for one Oracle instance. For instance you may have one listener for the applications another listener for DBA administration tasks as well as one listener dedicated to dataguard broker. It is not possible to have several listeners listening on the same IP and Port.
By default the database try to automatically register to a listener on port 1521. To instruct the instance to register to a specifc list of listeners you can add in the init.ora the local_listener parameter with an alias definition:
i.e
local_listener=MY_SET_OFF_LISTENERS
in your tnsname.ora add an entry called:
MY_SET_OFF_LISTENERS_LOCAL= (ADDRESS_LIST=
(ADRESS=(PROTOCOL=TCP)(HOST=myhostname)(PORT=1530))
(ADRESS=(PROTOCOL=TCP)(HOST=myhostname)(PORT=1531))
(ADRESS=(PROTOCOL=TCP)(HOST=myhostname)(PORT=1532))
In this sample your instance will register to three listeners listening on respectively port 1530, 1531 and 1532
If you want your clients can be balanced over the 3 listeners

Multiple ASM instances using single cluster install - Is it possible??

Hi,
I have 2 node RAC cluster installed on Linux. All the storage is on EMC. I need to setup another environment using HP storage on the same hosts. Is it possible to created second ASM instance using the same cluster install?? I wanted to have clear separation b/w EMC and HP environments and that's wondering if it's feasible to do that.
Haven't tried it yet to see if it complains.
Thx
Anitha

Anitha,
The data migration won't happen (at least not aggressively) until you do step 2 in your list where you remove the EMC disks. That removal operation will take a long time as Oracle will have to move the data before it can complete the operation. If you want to be sure, I'd recommend creating a new disk group with one of your new disks, put a small tablespace in it, create some data in it, then add a disk to that new group and remove the original disk. Then you'll have some confidence in the procedure and verify that it works without risking your production data. After you test, you can drop the disk group and use the disks for their intended purposes.
To answer your question, yes, that's the process exactly as I suggested it above. Should work fine--but will probably take a while to do the remove, so be prepared to leave that running for quite a while (i.e. don't expect to close the terminal and go home right after running the remove).
Dan

Cannot add multiple members of a failover cluster to a DFSR replication group

Server 2012 RTM. I have two physical servers, in two separate data centers 35 miles apart, with a GbE link over metro fibre between them. Both have a large (10TB+) local RAID storage arrays, but given the physical separation there is no physical shared storage.
The hosts need to be in a Windows failover cluster (WSFC), so that I can run high-availability VMs and SQL Availability Groups across these two hosts for HA and DR. VM and SQL app data storage is using a SOFS (scale out file server) network share on separate
servers.
I need to be able to use DFSR to replicate multi-TB user data file folders between the two local storage arrays on these two hosts for HA and DR. But when I try to add the second server to a DFSR replication group, I get the error:
The specified member is part of a failover cluster that is already a member of the replication group. You cannot add multiple members for the same cluster to a replication group.
I'm not clear why this has to be a restriction. I need to be able to replicate files somehow for HA & DR of the 10TB+ of file storage. I can't use a clustered file server for file storage, as I don't have any shared storage on these two servers. Likewise
I can't run a HA single DFSR target for the same reason (no shared storage) - and in any case, this doesn't solve the problem of replicating files between the two hosts for HA & DR. DFSR is the solution for replicating files storage across servers with
non-shared storage.
Why would there be a restriction against using DFSR between multiple hosts in a cluster, so long as you are not trying to replicate folders in a shared storage target accessible to both hosts (which would obviously be a problem)? So long as you are not replicating
folders in c:\ClusterStorage, there should be no conflict.
Is there a workaround or alternative solution?

Yes, I read that series. But it doesn't address the issue. The article is about making a DFSR target highly available. That won't help me here.
I need to be able to use DFSR to replicate files between two different servers, with those servers being in a WSFC for the purpose of providing other clustered services (Hyper-V, SQL availability groups, etc.). DFSR should not interfere with this, but it
is being blocked between nodes in the same WSFC for a reason that is not clear to me.
This is a valid use case and I can't see an alternative solution in the case where you only have two physical servers. Windows needs to be able to provide HA, DR, and replication of everything - VMs, SQL, and file folders. But it seems that this artificial
barrier is causing us to need to choose either clustered services or DFSR between nodes. But I can't see any rationale to block DFSR between cluster nodes - especially those without shared storage.
Perhaps this blanket block should be changed to a more selective block at the DFSR folder level, not the node level.

Interesting load issue on a new 11.2.0.3.0 RAC cluster

Hi All,
This is for a two node 11.2.0.3.0 Std RAC cluster running RHEL 5.4 x64.
I've built a good few RAC clusters before, and this is a new issue in 11.2.0.3.0 (I haven't seen it in 10.2.0.4/5, 11.1.0.6/7, or 11.2.0.1/2). What I've noticed is that the grid infrastructure processes are "busier" on both nodes than they were in previous releases. These include, but are not limited to, ocssd.bin, gipcd.bin, and oraagent.bin.
Load isn't "high", but the database isn't in use and the load on the server is sitting at around 1.05, whereas on other idle clusters it would be a quarter of that, on average. Has anyone else observed this behavior? If possible, provide a MOS article.
If not, I will escalate this to Oracle and see what they say.
Thanks.

It seems that grid processes in 11g are not fully optimized/tested and due to that higher load can be expected to appear although the 'real', actual load on the system is not happening.
Few months ago we had similar situation on 11.2.0.2 two node RAC.
On one node, grid user(eons resource) was doing high CPU load causing load on the OS varying from 3-4, database was almost completely inactive,there were no other software installed on the nodes except oracle and on
the second node load was at the same time varying from 0,2-0,5.
I resolved that by doing a stop/start of the eons resource on the overloaded node.
There are several articles on support.oracle.com about similar situations with grid.
Some of them are:
High Resource Usage by 11.2.0.1 EONS [ID 1062675.1]
Bug 9378784: EONS HIGH RESOURCE USAGE

RMAN Backup to Disk in a RAC cluster...?

We have a two-node RAC cluster, using Linux and ASM. Pretty typical setup.
We are backing up to disk via RMAN. Right now, that filesystem is mounted on node #1. It's a SAN volume but is not presently clustered.
My questions...
(1) Is it best practice that only one node out of the cluster performs the backups?
(2) Or is there a config where all nodes participate in the backup?
My concerns are what happens when node #1 fails (presumably we'd have to mount the volume on node #2), and also the asymmetrical load during backups.
Thank you!

Hello;
Managing backup and recovery for RAC databases is no different from managing those for single-instance databases.
RMAN backs up the database not the individual instance.
This may help :
http://www.databasejournal.com/features/oracle/article.php/3665211/Oracle-RAC-Administration--Backing-up-your-RAC-with-RMAN.htm
Instance Recovery in Oracle RAC
http://docs.oracle.com/cd/E11882_01/rac.112/e16795/backup.htm#i492578
Best Regards
mseberg

Multiple listeners on a RAC cluster?

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