It seems for the cost of running 2 large instances, I can run about 40 micro instances. In a distributed system (MongoDB in my case), 40 micro instances sounds a lot faster than 2 large instances, assume the database file is on EBS in both cases.
It this true?开发者_如何学JAVA
Micro instances may have 97% CPU "steal" time, and they can be unresponsive for several seconds.
In many use cases it's not acceptable to have to wait 15 seconds for a reply. I think small instances are the best deal. I run several of them and I divide the risk of problems and the load among them.
source: personal experience and this article
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