500 Concurrent Users: 2 J2EE Servers are enough???

Hello All,
We are planning to build the PRD system for the client on the MSCS Cluster environment. There will be 500 concurrent users and they want to have 2 J2EE Servers.
Now my Question is although there's no Single Point of Failure(SPOF) can we go ahead with the 2 J2EE Servers (I think we should not).
We are suggesting 3 J2EE Servers instead of 2 as the matter of the fact with 2 Servers is, What if one of the server goes down, all the load will be then on the single Server which may not handle all the load and may die too.
So i'm looking for the strong points to convince them for 3 Servers instead of 2.
Any ideas...
Points are guranteed
Vaib

In my experience, a single server with a 1.5GB heap size will handle about 500 - 700 users. A lot of this depends upon what exactly is going on in the portal. ESS and MSS will tend to have a greater impact on the portal than BW reports. I would say that the strongest way to convince them of this is to execute some load tests and see where the limits of your boxes are based upon your specific portal implementation.

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-- Rob
DT wrote:
>
I have a application in hand which will be reqd to support 100000 txns per day and about 500 concurrent user
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"DT" <[email protected]> wrote:
>
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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

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500 Concurrent Users: 2 J2EE Servers are enough???

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