Optimizing Server Architecture with Apache/Varnish/MySQL on Linux

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http://serverfault.com – I am a server administrator for a small start-up as a side venture (meaning I am by no means a well seasoned expert on the subject), and I recently helped move the site from a single windows machine to a cluster of machines on Rackspace Cloud. Currently the site benchmarks at about 600 requests/second, but given the amount of resources we have allocated to it, I feel it could be much higher. Right now we are using the Rackspace Cloud Load Balancer (Apache Zeus) in front of 8 web servers. Each web server is running Linux on a 512MB cloud instance and the content is being served by Varnish wi (HowTos)