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thanks for having put things in the right perspective. I agree with you. I did some reading and found: <ul> <li>Flickr: <a href="http://highscalability.com/flickr-architecture" rel="nofollow noreferrer">http://highscalability.com/flickr-architecture</a> 4 billion queries per day --> about 50000 queries/s</li> <li>Youtube: <a href="http://highscalability.com/youtube-architecture" rel="nofollow noreferrer">http://highscalability.com/youtube-architecture</a> 100 million video views/day --> about 1200 video views/second</li> <li>PlentyOfFish: <a href="http://highscalability.com/plentyoffish-architecture" rel="nofollow noreferrer">http://highscalability.com/plentyoffish-architecture</a> 600 pages/second 200 Mbps used CDN used</li> <li>Twitter: <a href="http://highscalability.com/scaling-twitter-making-twitter-10000-percent-faster" rel="nofollow noreferrer">http://highscalability.com/scaling-twitter-making-twitter-10000-percent-faster</a> 300 tweets/second 600 req/s</li> </ul> A very top end LB like <a href="http://www.f5.com/pdf/products/viprion-overview-ds.pdf" rel="nofollow noreferrer">this</a> can scale up : <ul> <li>200,000 SSL handshakes per second </li> <li>1 million TCP connections per second</li> <li>3.2 million HTTP requests per second </li> <li>36 Gbps of TCP or HTTP throughput</li> </ul> Therefore, you are right a LB could hardly become a bottleneck. Anyway I found this (old) article <a href="http://www.tenereillo.com/GSLBPageOfShame.htm" rel="nofollow noreferrer">http://www.tenereillo.com/GSLBPageOfShame.htm</a> where it is explained that geo-aware DNS could create availability issues. Could someone comment on that article? Thanks, Valentino
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1. POLoad balancing: DNS round robin in front of hardware load balancers. How to share stickiness?
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1. USValentino Miazzo
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1. COMoved the sub-question to http://serverfault.com/questions/69864/could-a-geo-dns-create-availability-issues
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