I've been playing around with Amazon's Web Services for over a year now, however I don't quite understand how it works. When I for example select an AMI of my choice from the EC2 console and I continue through the wizard, I reach the "Storage Configuration Tab". There are several options here.
There is the root volume tab and then there is the EBS volume tab. How do both of these differ? What is the maximum size I can allocate for each? How can I configure the EBS Volumes to work with my Instance? Say for example I decide to create 8 EBS volumes each with 25 GB of storage, for something like a Postgresql database which naturally installs on the root device, how I configure it so the database is stored across the 8 EBS volumes? In a sense, the 8 EBS volumes are seen as one 200 GB?