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A comment on Ask HN: How do big web sites roll out new versions?.

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Re:Ask HN: How do big web sites roll out new versions? by bjclark on Saturday December 27, 2008 @03:53PM (#411346)
A regex of machines? Every odd machine in the first datacenter? Software load balancers?

Uh, I'm guessing most places do it much more scientifically than that, and I would be very surprised if anyone in the top 100 sites is using a software loadbalancer (I only know of Wordpress using nginx http://barry.wordpress.com/2008/04/28/load-balancer-update/).

Most places run a dedicated hardward loadbalancers from F5 or Cisco or Juniper.

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