Oracle rac 10g

Dear all,
I have by mistake posted this RAC related question under 'database' - Sorry about that. Below is my post and two replies from users
Dear all,
I am installing rac on 3 node
OS is SLES 10
I am confused about partitions:
I am following the document
http://www.oracle.com/technology/pub/articles/smiley_rac10g_install.html
Somewhere in the document it is mentioned about "Partition the Disks" It says :
"Repeat the above steps for each disk to be partitioned. Disk partitioning should be done from one node only. When finished partitioning, run the 'partprobe' command as root on each of the remaining cluster nodes in order to assure that the new partitions are configured.
I am confused on "repeeat the above steps for each disk" and then it says "disk partitioning should be done from one node only"
my 3 nodes are exactly the same and it is EXT3
# fdisk -l /dev/sda2
Disk /dev/sda2: 20.3 GB, 20390469120 bytes
255 heads, 63 sectors/track, 2479 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Do I have to add extra disk space to each of the nodes and then partition and then make cluster file system
Reply 1 :
Hi
You have to perform the partiioning of your disks just on 1 node, when they are partionned it isn't necessary to do it again on other nodes. you will have after the partioning to run the 'partprobe' command as root on each of the remaining cluster nodes
Please note that your next questions about RAC should be published in :
Forum Home » Grid Computing » RAC, ASM & Clusterware Installation
Thanks.
Regards,
Hub
Reply 2:
"Do I have to add extra disk space to each of the nodes and then partition and then make cluster file system"
They are talking about the shared storage (SAN/FC disk array). You cannot set up rac just with local disks.
My question is : It means that I must have altogether one extra space not on the local disks but something on SAN/FC disk array and then from one of the nodes just partition that disk and continue as said in the manuals
Thanks in advance

May I suggest you to read the first chapter of the RAC admin guide in order to get a big picture of this cluster solution.
RAC required external shared disks for storing the Oracle Clusterware (Oracle Cluster Registry and voting disk) files, and database files.

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Since you didn't say "thank you", I assumed my time was of no value to you.
However, I shall try again.
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karlarao.wordpress.com
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Sarat Chandra C wrote:
Dear Oracle Experts et all
I have a couple of questions for Oracle 10g RAC implementation on Solaris and seek your advice. we are attempting to implement oracle 10g RAC on Solaris OS and SPARC Platform.
1 We are wondering if Oracle 10g RAC could be implemented on Solaris Local/Logical Containers? My understanding is that RAC in a Zone (Container) is not supported by Oracle, and will not work anyway. Regardless of installation, RAC needs to do cluster level stuff about the cluster configuration, changing network addresses dynamically, and sending guaranteed messages over the cluster interconnect. None of this stuff can be done in a Local Zone in Solaris, because Local Zones have fewer permissions that the Global Zone. This is part of the design of Solaris Zones, and nothing to do with how Oracle RAC itself works on them.
This is all down to the security model of Zones, and Local Zones lack the ability to do certain things, to stop them reconfiguring themselves and impacting other Zones. Hence RAC cannot do dynamic cluster reconfiguration in a Local Zone, such as changing virtual network addresses when a node fails.
My understanding is that RAC just cannot work in a Local Zone. This was certainly true 5 years ago (mid 2005), and was a result of the inherent design and implementation of Zones in Solaris. Things may have changed, so check the Solaris documentation, and check if Oracle RAC is supported in Local Zones. However, as I said, this limitation was inherent in the design of Zones, so I do not see how Sun could possibly have changed it so that RAC would work in a Local Zone.
To me, your only option is the Global Zone. Which pretty much destroys the argument for having Zones on a Solaris system, unless you can host other non-Oracle application on the other Zones.
2 The idea of RAC we are looking at is to have multiple Oracle Installations on top of native clustering solution say veritas clusters/Sun Clusters. Do we still need to have Oracle Cluster solution Clusterware (ORACRS) on top of this to achieve Oracle Clustering? Will I be able to install Oracle as a standalone installation on top of native clustering solution say veritas clusters/Sun Clusters?I am not sure the term 'native' is correct. All 'Cluster' software is low level, and has components that run within the operating system. Whether this is Sun Cluster, Veritas Cluster Server, or Oracle Clusterware. They are all as 'native' to Solaris as each other. They all perform the same function for Oracle RAC around Cluster management - which nodes are members of the cluster, heartbeats between nodes, reliable fast message delivery, etc.
You only need one piece of Cluster software. So pick one and use it. If you use the Sun or Veritas cluster products, then you do not need the Oracle Clusterware software. But I would use it, because it is free (included with RAC), is from Oracle themselves and so guaranteed to work, is fully supported, and is one less third party product to deal with. Having an all Oracle software stack makes things simpler and more reliable, as far as I am concerned. You can be sure that Oracle will have fully tested RAC on their own Clusterware, and be able to replicate any issues in their own support environments.
Officially the Sun and Veritas products will work and are supported. But when you get a problem with your Cluster environment, who are you going to call? You really want to avoid "finger pointing" when you have a problem, with each vendor blaming the cause of the problem on another vendor. Using an all Oracle stack is simpler, and ensures Oracle will "own" all your support problems.
Also future upgrades between versions will be simpler, as Oracle will release all their software together, and have tested it together. When using third party Cluster software, you have to wait for all vendors to release new versions of their own software, and then wait again while it is tested against all the different third party software that runs on it. I have heard of customers stuck on old versions of certain cluster products, who cannot upgrade because there are no compatible combinations in the support matrices between the cluster product and Oracle database versions.
I will configure Clustering Solution like VRTS/SunCluster in Active-Passive, then have 3 Oracle installations on Node A, another 3 on Node B. As I said before, these 3 Oracle installations will actually all be on the same Global Zone, because RAC will not go into Local Zones.
John

Oracle rac 10g

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