RE: Question about RAC

Alex,  

The NICs and the interconnect are related to the cluster (CRS). There is only one cluster per RAC.  

There will only be one interconnect and one VIP set per cluster no matter how many instances are running.  

-Bryan  

From: amonte [mailto:ax.mount_at_gmail.com] Sent: Monday, October 30, 2006 3:41 PM
To: Bryan Thomas
Cc: Anurag Verma; oracle-l_at_freelists.org Subject: Re: Question about RAC  

Hi Bryan  

Did each instance have dedicated NIC and Interconnect?  

TIA   Alex  

On 10/30/06, Bryan Thomas <bthomas_at_perftuning.com> wrote:

Anurag,  

This is standard practice among most RAC installations. Last week I upgraded a 4-node cluster that had 5 instances on each node.  

The obvious question is - How much memory do they have? Each instance will require its own SGA.      

Bryan Thomas

Senior Consultant and Practice Manager

Performance Tuning Corporation

b_removeme_thomas_at_perftuning.com

www.perftuning.com <http://www.perftuning.com/>    

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of amonte
Sent: Monday, October 30, 2006 2:38 PM
To: Anurag Verma
Cc: oracle-l_at_freelists.org
Subject: Re: Question about RAC  

Sorry I should have stated clearer.  

Say we have server srv1 and srv2 a database called RAC in the shared storage and a instance rac1 in srv1 and rac2 in srv2, that is the usual implementation I have seen.  

The customer wants this:  

database RAC and CAR in shared storage  

instance rac1 and car1 in srv1

instance rac2 and car2 in srv2  

Obviously rac1 and rac2 forms RAC and car1 and car2 forms CAR. Not very logical in my opinion, seems like others think so.  

TIA   Alex  

On 10/30/06, Anurag Verma < anuragdba_at_gmail.com <mailto:anuragdba_at_gmail.com>
> wrote:

Do you mean for a single database, use 4 instances each in 2 servers??  

Then what is the meaning of high availability??  

If the customer wants RACing 4 seperate databases each with 2 RAC instances on the 2 servers/nodes, then that is possible.  

If it is the first case, you have to educate the customer...  

Anurag  

On 10/30/06, amonte < ax.mount_at_gmail.com <mailto:ax.mount_at_gmail.com> > wrote:

Hi all  

I have a question about RAC.  

I have implemented a few RAC on a couple of customers. I have always worked with two nodes and a single database, i.e 2 servers and a common database in a shared storage.  

I have a customer who wants to use 2 servers to implement 4 RACs, i.e hacing 4 instances in each server. Has anyone done this sort of implemntation? I am not sure if this is logical or ilogical :-)    

Thanks  

Alex        

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