Getting Good IO from Amazon's EBS

Getting Good IO from Amazon's EBS: "Now, I just need to take a moment to point something out. Performance testing on EBS is very hard. The disks speed up and slow down on their own. A lot. Telling when your tweak is helping vs it just being luck is not easy. It feels a bit like trying to clock the speed of passing cars with a radar gun from the back of a rampaging bull. I fully expect to find that some of my discoveries here are just a mare’s nest, but hopefully others will prove enduring."