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Hi,

I would recommend you start by reading the "Segregating Your Cloud" section in the OpenStack Operations Guide:

http://docs.openstack.org/trunk/openstack-ops/content/scaling.html#segregate_cloud

(some basic chinese translation is here if that is useful to you : https://github.com/cloudisopen/OpenStack/blob/master/source/Architecture/Scaling.rst)

As an example, I used to work on a cloud that had 8 different data centres providing a cloud on a single API endpoint. Each datacentre was a 'cell', but within each cell could be multiple host aggregates.