Are we talking about Orbitz running Linux clusters as in openMosix or Beowulf?
Chism: Our Linux servers are not clustered in the sense that I think you mean. We don’t use Beowulf, or any other clustering software for creating one large “virtual server” out of many smaller machines. It never seemed appropriate to the problem we were trying to solve to introduce that kind of complexity into the system. We are able to generate a similar but not identical effect through the use of our own application-level load balancers and work coordinators as well as network load balancers. In essence, the “clients” of any one layer only know about a load balancer, and the load balancer is aware of all the machines that sit behind it and actually do the work. It forwards the request in such a way that it ensures the response goes to the correct client. The clustering we do is basically for scalability. It allows us to add machines and to not be affected by individual failuresto add machines on the fly without any impact on the systems client. Since day one, our goal has been to be
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