Reducing Cost

Dear Friends,
I am looking at bringing down the cost of Oracle database and application infrastructure running on Linux
Servers Environment :- 20-30 servers which are already using RAC consisting of PROD/TEST/TRAINING/DEV.
I have thought of the following area:-
1. Virtualizing DEV/Training/Test environment into lesser servers and this will help me in reducing total number of CPU's and hence will reduce Oracle licensing cost.
Could anybody help me in adding on the areas which are to be looked upon in order to atleast start thinking on bringing down the cost.
Regards
Sumit

sumitsingh3 wrote:
Let me add some more information about the environment
Application A :- Oracle 10g database across 5 servers:
•     Machine01/02 servers host the Production system in a 2-node RAC cluster.
•     Machine03/04 host the 3 non-production databases, for dev, test and train in a 2-node RAC cluster.
•     Machine05 hosts the recovered Production database as a single instance at some another loaction and only runs in a DR situation (or test).
Application A :- Oracle 10g application server across 5 servers.
•     Machine06/07 servers host the Production system in a load balanced, non-clustered architecture.
•     Machine08/09 host the 3 non-production , for dev, test and train in a load balanced, non-clustered architecture – but only one of these is actively running at a given point in time.
•     Machine10 hosts the recovered Production application as a single instance at some another loaction and only runs in a DR situation (or test).
A couple of thoughts:
First, your machine 8/9 pair ought to be running RAC if they're suipposed to be dev/test machines for a production RAC system. If you don't run RAC, then it's possible that some RAC-related side effect won't be discovered in new code until after it's gone live.
Having said that, you don't really have much scope for reducing machine count.
You could combine 3/4 with 8/9 - and arrange to minimise the number of instances up at any time.
You could then combine 3/4 into a single machine, with two virtual machines to run the RAC nodes (or even 4 virtual machines to emulate two sets of 2-node RAC). In principle this would be okay - in practice I don't think it would be a good idea if you think there would be any code putting a heavy load on the interconnect, as running an interconnect between two virtual machines is a bit of an odditiy.
As for 1/2/4 and 6/7/10, you probably don't want to change the way that you are using them if your reason for that setup was high availability - any extra layers in that area is likely to reduce availability, and once an HA solution works well, any change is a threat.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking" Carl Sagan

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