If you use Resin/J:Rockit/NewISys 2100, you can do at least 4,000 cocurent users w/ sub second response time. (test your app w/ free DiselTest - part of Jasic and linked on basicPortal.com, other links there to)
NewIsys is a 1U.
A 19" rack can hold 40. You need 3-4 racks.
He.net charges $400 per month per rack, so $1200-$1400 for 3-4 full racks to co/lo. (I might cost out blade performance to lower rack cost).
Tou migh want to use pgSQL.


Open source is great at large sites that are run for profit. (I wonder what MS SQL/Share point costs for 4 racks?)

Good luck.
.V


Heart Prince wrote:
howmany concurrent users does tomcat support? if i want to design a web application for 30,000 concurrent users, what is the step? clustering is related to this? how many servers i need if i am clustering

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