Re: RAC

From: DA Morgan <damorgan_at_psoug.org>
Date: Mon, 13 Aug 2007 11:18:25 -0700
Message-ID: <1187029104.915203@bubbleator.drizzle.com>

DJH wrote:
> hjr.pythian_at_gmail.com wrote:

>> A shared storage technology is a prerequisite for RAC.

>
>
> Yes, I do have the physical shared storage by means of dual-ported
> controller.. etc.
>
> My main issue is that will a clustered file system be required for the
> database/control/data files if there is ASM available for the raw shared
> storage? Does ASM handle the functions of a clustered file system such
> as coherent/ lock synchronized file access with regard to database
> centric files? Do you require ASM+CFS or just ASM?
>
> Thanks
>
>

>> There are three possible shared storage technologies.
>>
>> 1. Raw
>> 2. ASM
>> 3. A cluster file system
>>
>> Oracle provide (2) and OCFS2 is their offering in respect of (3),
>> though 3rd party commercial cluster file systems are of course
>> available.
>>
>> You can't do RAC without picking one of these options, but you are not
>> obliged to pick option 3.
>>
>> The Oracle Clusterware installation will detect which shared storage
>> technology is in use and will respond appropriately. But if it doesn't
>> detect one or other of these three options, it will complain loudly
>> and refuse to proceed.

A dual ported controller is irrelevant to RAC. I not sure you understand the concept of shared everything. I build 2-8 node RAC clusters, and have built a 24 node cluster, not once using a dual ported controller.

The questions you are asking are RAC basics. Go to tahiti.oracle.com and read the docs.

What you need to have available, and that you don't seem to be focused on is where to put the OCR and VOTE because you can not put them on ASM disk. They must go on RAW or CFS.

-- 
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu (replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org

Received on Mon Aug 13 2007 - 13:18:25 CDT