I created a small Amazon EC2 instance like this:
ec2-run-instances --group default --block-device-mapping "/dev/sda1=:16:off" \
--instance-initiated-shutdown-behavior stop ami-cb97c68e
That created a fixed disk for the instance in Amazon’s Elastic Block Store. Now I find I would like to upgrade to a large instance of EC2… but I would like to continue using the fixed disk I created for the small instance.
How do I switch it over? (For the record, that AMI is for the US West Ubuntu image.)
Coincidentally, Eric Hammond has just written an article about this exact topic. I think it should answer your question perfectly.