How does multiple EC2 instances (scaling) works on one EBS for data storage?

It seems that you need to create an EBS snapshot of your most up to date EC2 instance. This will create an EBS backed AMI. You would then need to terminate all your EC2 instances that are not up to date and launch a new stack of instances from your newly created AMI.

If you had a load balancer running then you would have to attach these new instances to your load balancer also. It seems a little long-winded but it can all be done programmatically. At least this is how I think scaling in the cloud with Amazon works and far as propagating changes across multiple instances goes.

Somebody else with more experience verify this. I plan to test it out myself later on.

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