Hello, Dear TC and all, 

Large cloud operators prefer to deploy multiple OpenStack instances(as 
different zones), rather than a single monolithic OpenStack instance because of 
these reasons:
1) Multiple data centers distributed geographically;
2) Multi-vendor business policy;
3) Server nodes scale up modularized from 00's up to million;
4) Fault and maintenance isolation between zones (only REST interface);
At the same time, they also want to integrate these OpenStack instances into 
one cloud. Instead of proprietary orchestration layer, they want to use 
standard OpenStack framework for Northbound API compatibility with HEAT/Horizon 
or other 3rd ecosystem apps.
We call this pattern as "OpenStack Cascading", with proposal described by 
[1][2]. PoC live demo video can be found[3][4].
Nova, Cinder, Neutron, Ceilometer and Glance (optional) are involved in the 
OpenStack cascading. 
Kindly ask for cross program design summit session to discuss OpenStack 
cascading and the contribution to Kilo. 

Kindly invite those who are interested in the OpenStack cascading to work 
together and contribute it to OpenStack. 
(I applied for “other projects” track [5], but it would be better to have a 
discussion as a formal cross program session, because many core programs are 
involved )
[1] wiki: https://wiki.openstack.org/wiki/OpenStack_cascading_solution
[2] PoC source code: https://github.com/stackforge/tricircle
[3] Live demo video at YouTube: https://www.youtube.com/watch?v=OSU6PYRz5qY
[4] Live demo video at Youku (low quality, for those who can't access 
[5] http://www.mail-archive.com/openstack-dev@lists.openstack.org/msg36395.html
Best Regards
Chaoyi Huang ( Joe Huang )
OpenStack-dev mailing list

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