[Catalyst] Hypothetical Site and Scalability Planning

Dave Rolsky autarch at urth.org
Fri Oct 26 22:51:10 GMT 2007

On Fri, 26 Oct 2007, J. Shirley wrote:

> Another piece of advice: Don't look at requests per second as the idea of
> webserver scalability -- sure, you want to have efficient code, but that is
> just efficient code measurement; not scalability.  Look at it this way: How
> many webservers do I need to add to my cluster to double traffic.  If there
> answer is more than two, start looking at bottlenecks.  If it is two, and
> you are still near peak usage, look at bottlenecks.  If you add two, and
> everything is running smooth then you are probably in good shape.

This doesn't make any sense if you look at the math.

If I currently handle 1M hits/day with 20 web servers, I hardly can expect 
to handle traffic of 2M hits/day with 22 web servers, can I?

Did you mean "double" instead of "two"? That'd make more sense.


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