I have a regular EC2 instance A with a 200GB SSD filled with data. I used this disk to create an AMI and used that AMI to spin up another EC2 instance B with the same specs.
B started almost instantaneously which surprised me since I thought there would be a delay while AWS copies my 200GB EBS to the SSD corresponding to the new instance. However I noticed IO is extremely slow on B. It takes 3x as long to parse data on B.
Why is this, and how can I overcome this? It's too slow for my application which requires fast disk IO.