Episode 2 - L2 cache for JPA, write-behind and high availability.
Using eXtreme Scale for a L2 cache for OpenJPA or Hibernate: OpenJPA/Hibernate L2 cache with WebSphere eXtreme Scale
Write-behind database synchronization overview and use cases
Write behind: What is it and how does it work?
WebSphere eXtreme Scale and Databases with more on write behind
Achieving high availability with eXtreme Scale: High Availability: Data availability in WebSphere eXtreme Scale