1) Infrastructure services offered by multiple Openstack deployments in geographical distributed DCs need to be consolidated into a unified one;
2) Vendor agnostic and unified Openstack API is expected even when the Openstack resource pools in different DCs are provided by different vendors
3) Unified Openstack resource pooling needs to flexibly scale out from several Servers/VMs up to millions of Servers/ VMs;
4) Rolling update with minimized service interruption is expected when upgrading the Openstack Cloud OS software, SOA Restful API is preferred over RPC internal messaging interface for the orchestration & communication between different availability zones.
The answer is OpenStack Cascading solution. The speech will cover background requirements and customer value analysis, technical elaboration of OpenStack Cascading solution, and its Demo. Overview of OpenStack cascading solution can be found at https://wiki.openstack.org/wiki/OpenStack_cascading_solution