Folks,
This is a very broad question and could have many answers but still wanted to ask to see what people are thinking and doing.
We have DC with multiple racks and around 600 nodes so we are planning to create 3 private openstack and each with 200 nodes. In other data centers we have multiple 200 nodes openstack clusters and life is good. In the new datacenter I am thinking of deploying the same way openstack but shared keystone between multiple openstack environments to have a single place for identification and I am going to call it 3 regions even it's in a single DC. Hope shared keystone is helpful/easier for doing terrafrom work and selecting region easily.
Other option I was thinking about to deploy cellv2 technology and put all 600 nodes in single cloud but always worried for operation point of view. Now sure how many people running cellv2 successfully without pain. (Except CERN)
If people running multi-region openstack cloud then please share some thought and idea to make life easier. Not looking for best solution but just clue to get idea to deploy and manage multiple openstack.
Thanks in advance. S