This paper presents the results of the test conducted on a 58-node Cluster 1300 system, simultaneously running eight instances of e-Business Trade 2 benchmark tests on Red Hat Linux. This solution mounted in only three racks supported 800,000 users, serving an unprecedented 12,547 requests/sec with an average response time of 0.27 sec/request.
Clusters are the future!
http://www.linuxvirtualserver.org/