We use it at Rackspace under our Cloud Databases service. Check this out (high level) http://c1776742.cdn.cloudfiles.rackspacecloud.com/downloads/pdfs/Rackspac

We use it at Rackspace under our Cloud Databases service. Check this out (high level) http://c1776742.cdn.cloudfiles.rackspacecloud.com/downloads/pdfs/Rackspace-Cloud-Databases-and-Container-based-Virtualization.pdf http://c1776742.cdn.cloudfiles.rackspacecloud.com/downloads/... I think one reason it is not more common is because there are fewer people with expertise and it is more sophisticated (read complex).