Multiple region setup approach
We have two standalone OS instances into two different organizations each one of them have some of their own operations to service.
Both of these two instances have a huge amount of resources available at this period. We would like to setup these two, into one federated meta-cloud under these conditions :
Any Infrastructure may have private resources, users and management and operations. Any infrastructure may be unplugged at any time, with 0 notice from the federation (or modify the shared resources), but keep the private ones up & running. Avoid the most possible configuration from those infrastructures, and implement most of the operations into a 3rd one, that will work as a broker or load balancer or resource alocator.
Have you ever implemented something like that ? Do you have any software to suggest me ? Any good / bad practices ?