We have a web service running on Amazon EC2. Currently we have some live user data stored on a single disk (EBS). We are considering moving to a RAID0 setup (we don't have to be concerned about the increased failure rate).
If we do this migration, what is the quickest (to minimize site unavailability) way to reliably transfer the user data to the RAID array?
One idea I had was to take a recent snapshot of the data, copy it over to the new RAID array, then when the site goes down for maintenance use rsync to copy only the changed data over. I'm not sure if this would actually save time or ensure data integrity though.