OpenStack cascading solution is designed for large scale distributed cloud, for example, a cloud even has million level VMs distributed in many data centers.
OpenStack cascading mainly concentrates on multiple child OpenStack API aggregation, each child OpenStack exactly works internally as Amazon like availability zone, while the cloud still exposes one standard OpenStack API by the parent OpenStack to end user. Thus the solution brings Amazon like availability zone into current OpenStack for large scale distributed cloud, the benefit is as following:
Aggregated distributed cloud with one OpenStack API endpoint
Fault isolation with Amazon like availability zone
Reduce Upgrade / OAM challenge with availability zone granularity
Plug & Play fast integration of multi vendors / multi data centers cloud infrastrutcure with OpenStack API
Scale out architecture even across multiple data centers
Please refer to https://wiki.openstack.org/wiki/OpenStack_cascading_solution for more information.
Clipping is a handy way to collect important slides you want to go back to later.