Re: Can RAC One Node run on One node only!
- From: Q A I S E R <qrasheed@xxxxxxxxx>
- To: ORACLE-L <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 14 Apr 2010 09:24:20 -0500
Thanks for your responses!
Martin: Your assumption is correct. We are considering Linux platform for
this project.
Based on the responses that I received, we have two feasible options:
1. install RAC-One-Node in a one node cluster, and expand it later to a 2
node full RAC cluster.
2. install full RAC (with single instance) in a one node cluster, and
expand it later to a 2 node cluster.
I like we won'toption #1, though take adavantage of additional RAC-One-Node
features of cold failover/omotion. However we would save money, by paying
reduced licensing cost until we upgrade to full RAC.
Thanks,
--Qaiser
On Wed, Apr 14, 2010 at 2:58 AM, Martin Bach
<development@xxxxxxxxxxxxxxxxx>wrote:
> Hi Qaiser!
>
> I am assuming you are on the Linux platform as RAC One Node doesn't yet
> exist for anything else...
>
> On 04/13/2010 07:47 PM, Q A I S E R wrote:
> > We are considering Oracle RAC One Node for a small project. Due to
> > budget constraints they will only purchase one server at this time.
> > However they plan to get another server in six months, and we will run
> > 2-node RAC with the help of this additional node. We wanted to reduce
> > overhead of creating a non-RAC and then converting it into RAC. We
> > thought RAC One node would be useful feature in this scenario. However
> > after some research, it looks like Oracle RAC One Node is installed in
> > *one node of the cluster*. The cluster allows one to take advantage of
> > the Omotion technology to move the instance to a different node.
>
>
> RAC One Node works as follows:
> 1) You install the RAC software stack on all nodes of your cluster just
> as with a "normal" RAC installation. In your case, it's only one node.
>
> 2) You create a RAC database to run on ONLY ONE instance of the cluster.
> Still the same as with "normal" RAC (although with a RAC database you'd
> possibly make use of more than 1 node)
>
> 3) You need to install a patch from Metalink for RAC One Node (check the
> user guide, don't remember the exact patch number)
>
> 3) You call raconeinit and select your database instance
>
> >
> > We are not using Virtual Machine in this environment. The documentation
> > on this topic talks about installing RAC One node in the cluster. I have
> > not been able to find out, if RAC One Node can be installed on one
> > server only.
>
>
> It certainly can, but if I were you I wouldn't run what is effectively a
> single instance Oracle database with the RAC codepaths. You will have to
> maintain additional memory structures in RAC even if you don't use more
> than 1 node which provide an overhead.
>
> >
> > Is it possible to install RAC One Node on One server only? That is, in a
> > non-clustered environment, and without using VM.
>
>
> You will require shared storage for the OCR and voting disk-local
> storage only won't work.
>
> >
> > Thanks in advance!
> >
> > --Qaiser
>
> Hope that helps,
>
> Martin
> --
> Martin Bach
> OCM 10g
> http://martincarstenbach.wordpress.com
> http://www.linkedin.com/in/martincarstenbach
>
>
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