With SpatialKey we create AMI's that are exact replicas of each other and can be scaled easily all of the persistent content is stored in a EBS volume allowing us to deploy a new instance from a Snapshot and easy backup with Snapshots.
This article is the best one I have seen highlighting performance with EBS volumes. He also highlights using software based RAID and the performance numbers with RAID are impressive. I am loving Amazon Ec2 more and more each day.
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