This eLearning lecture consists of two parts. The first introduces you to mirrored server architecture and zoned server architecture. The second, which is prerecorded and given by the co-founder of ImonCloud, Dr. Shun-Yun HU, introduces you to the ImonCloud and the back-end architecture (which is a hybrid architecture and uses a type of VON).
Here are the videos. Note that the ImonCloud presentation video is password protected. The password is posted in IVLE announcement.
Here is the reference to ImonCloud:
Shun-Yun Hu, Matthew Lien, “ImonCloud: Easing Development and Deployment
for Scalable Networked Games”, IEEE CCNC 2014. [PDF]
There are no suitable references to the lecture on hybrid architecture. You can download the slides here.