AEM 6.4 Sample Architecture for Hybrid AEM and Shaded Deployment in Rackspace cloud

Hybrid AEM deployment with Rackspace Private Cloud, separate Bare Metal authors for content and asset management

AEM architecture diagram: sharded author with cloud publishers
The above diagram represents site with heavy authoring requirements so that it makes sense to shard out individual sites onto their own physical authoring environments. A Solr Cloud cluster plugs into the authors for indexing DAM assets and assisting with the custom authoring UI. The publish tier is served by Rackspace public cloud servers (OpenStack) which can easily be cloned and scaled up and down to meet load demands. connectivity between your author instance and Adobe Marketing Cloud

Reference: https://blog.rackspace.com/sample-architecture-diagrams-for-adobe-experience-manager