Possibility to create EBS volumes in amazon

I would like to dynamically create a mongo DB cluster in amazon using your app.
In order to have a good performance, I will have to create RAIDs on the Amazon EC2 EBS volumes.There is the possibility to create EBS volumes and attach them to a specific EC2 instance? Or it will be possible in the future?

So, my final environment will look, like this:
http://docs.mongodb.org/ecosystem/tutorial/install-mongodb-on-amazon-ec2/#AmazonEC2Quickstart-DeployingaSingleNode


Thanks,
Tudor