RE: Question about RAC
- From: "Bryan Thomas" <bthomas@xxxxxxxxxxxxxx>
- To: <ax.mount@xxxxxxxxx>, "'Anurag Verma'" <anuragdba@xxxxxxxxx>
- Date: Mon, 30 Oct 2006 15:31:49 -0600
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@xxxxxxxxxxxxxx
www.perftuning.com
_____
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of amonte
Sent: Monday, October 30, 2006 2:38 PM
To: Anurag Verma
Cc: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxx> 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@xxxxxxxxx> 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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