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copied!<p>I'm not sure if it's documented somewhere but we've been using ELBs for quite a while. And in essence ELBs are EC2 instances in front of the instances you are load balancing, it's our understanding that when your ELB starts experiencing more traffic, Amazon does some magic to turn that ELB instance from say a c1.medium to an m1.xlarge. </p> <p>So it could be that when you are starting to see peaks Amazon does some transitioning between the smaller to the larger ELB instance and you are seeing those delays.</p> <p>Again customers don't know what goes on inside Amazon so for all you know they could be experiencing heavy traffic at the same time you have your peaks and their load balancers are going berserk.</p> <p>You could probably avoid these delays by over-provisioning but who wants to spend more money.</p> <p>There a couple of things that I would recommend if you have time and resources:</p> <ol> <li><p>Setup an haproxy instance in front of your environment (some large instance) and monitor your traffic that way. Haproxy has a command line (or web) utility that allows you to see stats. Of course you also need to monitor your instance for things like CPU and memory.</p></li> <li><p>You may not be able to do in production in which case you are going to have to run <code>test traffic</code> through it. I recommend using something like <a href="http://loader.io/" rel="nofollow">loader.io</a>. Another options is to try to partially send some of the traffic to an haproxy instance, perhaps using GSLB (if your DNS provider supports it)</p></li> </ol>

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