Hard disk / RAM requirement for Oracle RAC

I'm using the following configuration for RAC
Oracle 10gR2
VMware Server
Host Server - Linux CentOS
Two Guest Servers - Linux CentOS
Now I'm trying with Pentium 4 and 1 GB RAM. But it is very slow and even hard to finish full RAC step.
What is the best hard disk / RAM configuration to support above specs?
Kindly advise me.
Thanks
Karti

i am using 3 gb RAM, 160 GB hard disk, intel Due core processor. Its working fine for 10gR2 same as you mentioned os & oracle version.
i dont know the minimum RAM Size, but i have seen tarry singh's RAC installation DEMO in dbasupport site with 2 GB RAM size.
so you need atleast 2 GB RAM. Minimum 1 GB for each guest OS.
i am new to RAC. wait for expert's reply.

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Hi,
We are planning a 2 node Oracle 9i RAC cluster on Sun Cluster 3.
Can you please explain these 2 questions?
1)
If we have a hardware disk array RAID controller with LUNs etc, then why do we need to have Veritas Volume Manager (VxVM) if all the LUNS are configured at a hardware level?
2)
Do we need to have VxFS? All our Oracle database files will be on raw partitions.
Thanks,
Steve

> We are planning a 2 node Oracle 9i RAC cluster on Sun
Cluster 3.Good. This is a popular configuration.
Can you please explain these 2 questions?
1)
If we have a hardware disk array RAID controller with
LUNs etc, then why do we need to have Veritas Volume
Manager (VxVM) if all the LUNS are configured at a
hardware level?VxVM is not required to run RAC. VxVM has an option (separately
licensable) which is specifically designed for OPS/RAC. But if
you have a highly reliable, multi-pathed, hardware RAID platform,
you are not required to have VxVM.
2)
Do we need to have VxFS? All our Oracle database
files will be on raw partitions.No.
IMHO, simplify is a good philosophy. Adding more software
and layers into a highly available design will tend to reduce
the availability. So, if you are going for maximum availabiliity,
you will want to avoid over-complicating the design. KISS.
In the case of RAC, or Oracle in general, many people do use
raw and Oracle has the ability to manage data in raw devices
pretty well. Oracle 10g further improves along these lines.
A tenet in the design of highly available systems is to keep
the data management as close to the application as possible.
Oracle, and especially 10g, are following this tenet. The only
danger here is that they could try to get too clever, and end up
following policies which are suboptimal as the underlying
technologies change. But even in this case, the policy is
coming from the application rather than the supporting platform.
-- richard

SYSTEM HARDWARE REQUIREMENT FOR ORACLE RAC +ORACLE GRID INFRASTRUCTURE

Hi Guru's,
Can anyone of you explain me what exactly the system H/W requirement for Installing Oracle 11gR2 Grid Infrastructure along with Oracle RAC.
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If you like to install RAC on vmware, this 8gb memory enough. you can allocate 2gb for one node and also other. So total 4GB enough for RAC installation.
Refer
Oracle 11gR2 two node Real application cluster installation step by step guide on linux using VMware Server | DBA

Hardware requirement for Oracle RAC 11g R2 on solaris

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bash-3.00# uname -a
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Copyright 2008 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 24 March 2008
bash-3.00# more /etc/release
Solaris 10 5/09 s10s_u7wos_08 SPARC
Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 30 March 2009
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check this note on MOS:
How to find RAC certifications in MOS Certification Tab [ID 1053954.1]
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Need clarification for firmware & MPIO version for Oracle RAC

Dear All,
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Please note that Oracle RAC doesnt have requirement any sepcific firm ware. If you upgrade the firmware, it should not break any existing config, so pls check with IBM.
Also if you are doing any specific firmware upgrade then IBM should provide the supported version list.
Hope this help,
Regards
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http://www.oracleracexpert.com

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Gig Ethernet V/S SCI as Cluster Private Interconnect for Oracle RAC

Hello Gurus
Can any one pls confirm if it's possible to configure 2 or more Gigabit Ethernet interconnects ( Sun Cluster 3.1 Private Interconnects) on a E6900 cluster ?
It's for a High Availability requirement of Oracle 9i RAC. i need to know ,
1) can i use gigabit ethernet as Private cluster interconnect for Deploying Oracle RAC on E6900 ?
2) What is the recommended Private Cluster Interconnect for Oracle RAC ? GiG ethernet or SCI with RSM ?
3) How about the scenarios where one can have say 3 X Gig Ethernet V/S 2 X SCI , as their cluster's Private Interconnects ?
4) How the Interconnect traffic gets distributed amongest the multiple GigaBit ethernet Interconnects ( For oracle RAC) , & is anything required to be done at oracle Rac Level to enable Oracle to recognise that there are multiple interconnect cards it needs to start utilizing all of the GigaBit ethernet Interfaces for transfering packets ?
5) what would happen to Oracle RAC if one of the Gigabit ethernet private interconnects fails
Have tried searching for this info but could not locate any doc that can precisely clarify these doubts that i have .........
thanks for the patience
Regards,
Nilesh

Answers inline...
Tim
Can any one pls confirm if it's possible to configure
2 or more Gigabit Ethernet interconnects ( Sun
Cluster 3.1 Private Interconnects) on a E6900
cluster ?Yes, absolutely. You can configure up to 6 NICs for the private networks. Traffic is automatically striped across them if you specify clprivnet0 to Oracle RAC (9i or 10g). That is TCP connections and UDP messages.
It's for a High Availability requirement of Oracle
9i RAC. i need to know ,
1) can i use gigabit ethernet as Private cluster
interconnect for Deploying Oracle RAC on E6900 ? Yes, definitely.
2) What is the recommended Private Cluster
Interconnect for Oracle RAC ? GiG ethernet or SCI
with RSM ? SCI is or is in the process of being EOL'ed. Gigabit is usually sufficient. Longer term you may want to consider Infiniband or 10 Gigabit ethernet with RDS.
3) How about the scenarios where one can have say 3 X
Gig Ethernet V/S 2 X SCI , as their cluster's
Private Interconnects ? I would still go for 3 x GbE because it is usually cheaper and will probably work just as well. The latency and bandwidth differences are often masked by the performance of the software higher up the stack. In short, unless you tuned the heck out of your application and just about everything else, don't worry too much about the difference between GbE and SCI.
4) How the Interconnect traffic gets distributed
amongest the multiple GigaBit ethernet Interconnects
( For oracle RAC) , & is anything required to be done
at oracle Rac Level to enable Oracle to recognise
that there are multiple interconnect cards it needs
to start utilizing all of the GigaBit ethernet
Interfaces for transfering packets ?You don't need to do anything at the Oracle level. That's the beauty of using Oracle RAC with Sun Cluster as opposed to RAC on its own. The striping takes place automatically and transparently behind the scenes.
5) what would happen to Oracle RAC if one of the
Gigabit ethernet private interconnects fails It's completely transparent. Oracle will never see the failure.
Have tried searching for this info but could not
locate any doc that can precisely clarify these
doubts that i have .........This is all covered in a paper that I have just completed and should be published after Christmas. Unfortunately, I cannot give out the paper yet.
thanks for the patience
Regards,
Nilesh

Any Oracle best practice/standards for inter-DataCente links for Oracle RAC

Hello Oracle Experts,
Am working for a customer to set up Oracle RAC architecture hosting SAP/Non-SAP applications per SLA levels(MC/BC/Standard) specs. Currently my network team needs calculation to arrive at whether we will go for a (1), (2) or (3) 10Gig links for inter DC (Data-Center) for Oracle RAC.. below is additional background:
•     Porting all client SAP/Non-SAP Oracle databases to new 2 data-centers.
•     There will be 10 blades (4x BL680s and 6x BL460s) in each DC (can scale-up/out later on).
•     Clusters architecture to support Extended/Stretched RAC cluster feature
•     Clusters 2-node each(1-datacenter1, 1-datacenter2) and nodes distributed across 2 x c7000 such that no cluster has more than one node in an enclosure.
•     Each node will have - 4 NIC ports ( 2 x public and 2 x private) , 2 dual-port HBA
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•     the versions are Oracle 11g RAC, Oracle 10g RAC and Oracle 9i (for DataGuard/Standby) on RHEL 6 on Proliant Blades (x86) + BladeMatrix
My network colleagues considering using DWDM across the 2 DCs(given the lesser cost?). Am still looking around if there are any Oracle/industry-best practices around this and having a calculation to support that..
Many Thanks in advance..
Regards,
Abhijit

Hi ,
There are no specific set of steps / practices for batch loading contents to ucm . It would be very much dependent on how many contents does the user have to load to UCM and how well the server is configured in terms of performance .
You can get more details from the following documentation link : http://docs.oracle.com/cd/E21043_01/doc.1111/e10792/c02_settings009.htm
Thanks,
Srinath

Adding Box for Oracle RAC(Clustering) to BIW 3.5 Oracle/Linus

Hai Gurus,
Suppose if we have 1 box with Bw3.5 Linux/Oracle and add another box to do Oracle RAC(clustring). Do we need to re-instal the Box 1 also or we can do that with small configuration changes.
Guide me.
Regards,
Mano

Hi Mano
As in most cases there is a short answer and a longer one. Short:
If your system is RAC ready, switching from single instance to cluster database and adding a new node is quite simple. From pure application side there will not be major changes necessary.
Long:
What do i need for oracle RAC, what do i have to do to make my system RAC ready?
Hardware / OS
You will need shared disks, cluster fs, on linux mostly OCFS2. If you don't have it yet, you need to get it and move your database on to it. You would probably need an additional lan interface for the interconnect.
Oracle / Database
You would have to install CRS, that is the oracle cluster software. Your oracle instance, listener will run as services controlled by CRS when RAC is enabled. You will need to configure separate redo threads and undo tablespaces for each node you add. Not least you would probably need an additional costly RAC extension license from your favorite oracle sales rep.
SAP
You should think about separate enqueue server and enqueue replication, although this is not mandatory. This is dependent on your reasons for using RAC. If it is high availability you should go for it.
This is not a complete list, i just wanted to give you an initial idea, please ask if you need further details. If you start into RAC just now, you will have a long way to go, otherwise the short answer will apply.
Best regards
Michael

OIM 9.1.0.2 - Weblogic JDBC Multi Data Sources for Oracle RAC

Does OIM OIM 9.1.0.2 BP07 support Weblogic JDBC Multi Data Sources (Services>JDBC>Multi Data Sources) for Oracle RAC instead of inserting the "Oracle RAC JDBC URL" on JDBC Data Sources for xlDS and xlXADS (Services>JDBC>Data Sources> xlDS|xlXADS > Connection Poll> URL) ?
If yes, is there are any other modifications that need to be made on OIM, or just changing the data sources?

Yes, it's supported. You install against one instance directly of the Rac Server. Then you update the config.xml file and the jdbc resource in your weblogic server with the full rac address. It is documented for installation against RAC. http://docs.oracle.com/cd/E14049_01/doc.9101/e14047/database.htm#insertedID2
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Encountered ora-29701 during Sun Cluster for Oracle RAC 9.2.0.7 startup (UR

Hi all,
Need some help from all out there
In our Sun Cluster 3.1 Data Service for Oracle RAC 9.2.0.7 (Solaris 9) configuration, my team had encountered
ora-29701 *Unable to connect to Cluster Manager*
during the startup of the Oracle RAC database instances on the Oracle RAC Server resources.
We tried the attached workaround by Oracle. This workaround works well for the 1^st time but it doesnt work anymore when the server is rebooted.
Kindly help me to check whether anyone encounter the same problem as the above and able to resolve. Thanks.
Bug No. 4262155
Filed 25-MAR-2005 Updated 11-APR-2005
Product Oracle Server - Enterprise Edition Product Version 9.2.0.6.0
Platform Linux x86
Platform Version 2.4.21-9.0.1
Database Version 9.2.0.6.0
Affects Platforms Port-Specific
Severity Severe Loss of Service
Status Not a Bug. To Filer
Base Bug N/A
Fixed in Product Version No Data
Problem statement:
ORA-29701 DURING DATABASE CREATION AFTER APPLYING 9.2.0.6 PATCHSET
*** 03/25/05 07:32 am ***
TAR:
PROBLEM:
Customer applied 9.2.0.6 patchset over 9.2.0.4 patchset.
While creating the database, customer receives following error:
ORA-29701: unable to connect to Cluster Manager
However, if customer goes from 9.2.0.4 -> 9.2.0.5 -> 9.2.0.6, the problem does not occur.
DIAGNOSTIC ANALYSIS:
It seems that the problem is with libskgxn9.so shared library.
For 9.2.0.4 -> 9.2.0.5 -> 9.2.0.6, the install log shows the following:
installActions2005-03-22_03-44-42PM.log:,
[libskgxn9.so->%ORACLE_HOME%/lib/libskgxn9.so 7933 plats=1=>[46]langs=1=> en,fr,ar,bn,pt_BR,bg,fr_CA,ca,hr,cs,da,nl,ar_EG,en_GB,et,fi,de,el,iw,hu,is,in, it,ja,ko,es,lv,lt,ms,es_MX,no,pl,pt,ro,ru,zh_CN,sk,sl,es_ES,sv,th,zh_TW, tr,uk,vi]]
installActions2005-03-22_04-13-03PM.log:, [libcmdll.so ->%ORACLE_HOME%/lib/libskgxn9.so 64274 plats=1=>[46] langs=-554696704=>[en]]
For 9.2.0.4 -> 9.2.0.6, install log shows:
installActions2005-03-22_04-13-03PM.log:, [libcmdll.so ->%ORACLE_HOME%/lib/libskgxn9.so 64274 plats=1=>[46] langs=-554696704=>[en]] does not exist.
This means that while patching from 9.2.0.4 -> 9.2.0.5, Installer copies the libcmdll.so library into libskgxn9.so, while patching from 9.2.0.4 -> 9.2.0.6 does not.
ORACM is located in /app/oracle/ORACM which is different than ORACLE_HOME in customer's environment.
WORKAROUND:
Customer is using the following workaround:
cd $ORACLE_HOME/rdbms/lib make -f ins_rdbms.mk rac_on ioracle ipc_udp
RELATED BUGS:
Bug 4169291

Check if following MOS note helps.
Series of ORA-7445 Errors After Applying 9.2.0.7.0 Patchset to 9.2.0.6.0 Database (Doc ID 373375.1)

Copper cable / GigE Copper Interface as Private Interconnect for Oracle RAC

Hello Gurus
Can some one confirm if the copper Cables ( Cat5/RJ45) can be used for Gig Ethernet i.e. Private interconnects for deploying Oracle RAC 9.x or 10gR2 on Solaris 9/10 .
i am planning to use 2 X GigE Interfaces (one port each from X4445 Quad Port Ethernet Adapters) & Planning to connect it using copper cables ( all the documents that i came across is been refering to the fiber cables for Private Interconnects , connecting GigE Interfaces , so i am getting bit confused )
would appretiate if some one can throw some lights on the same.
regards,
Nilesh Naik
thanks

Cat5/RJ45 can be used for Gig Ethernet Private interconnects for Oracle RAC. I would recommend trunking the two or more interconnects for redundancy. The X4445 adapters are compatible with the Sun Trunking 1.3 software (http://www.sun.com/products/networking/ethernet/suntrunking/). If you have servers that support the Nemo framework (bge, e1000g, xge, nge, rge, ixgb), you can use the Solaris 10 trunking software, dladmin.
We have a couple of SUN T2000 servers and are using the onboard GigE ports for the Oracle 10gR2 RAC interconnects. We upgraded the onboard NIC drivers to the e1000g and used the Solaris 10 trunking software. The next update of Solaris will have the e1000g drivers as the default for the SUN T2000 servers.

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.
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"why do we use reverse proxy for Oracle RAC Cluster setup".
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Cheers,
Brian

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Hard disk / RAM requirement for Oracle RAC

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