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Interview Question :: When is it advisable to use clustered web servers instead of a single machine


At what point is it better to run a cluster of web servers vs a single machine? We're currently running a web server machine and a SQL machine and the idea of running a cluster instead of the web server has been brought up. The web server runs .net pages and .net services.
Answers to "When is it advisable to use clustered web servers instead of a single machine"
RE: When is it advisable to use clustered web servers instead of a single machine?

What is going to determine whether you need a cluster or not is really the availability that you need. If you are running an environment that needs to be up 24x7 then a cluster may be the way to. However, if the cluster is active/passive (fail-over) then you will have hardware just sitting there doing nothing. There are other ways to achieve this though, using load balancing allows multiple web servers to exist behind a virtual IP - allowing web servers to be added and removed as required (YMMV with regard to service interruption depending on the nature of the content being served up by the web servers).
 
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RE: When is it advisable to use clustered web servers instead of a single machine?

advisable to use clustered web servers when you require an excellent fault tolerant environment and like 99.99999% uptime.



when time is money and a down webserver costs your company a lot of lost potential business.
 
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