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The different options mentioned at the link above require some thought process in the design. First an Availability Zone is the largest division of OpenStack resources, each AZ requires it's own set of controller or services nodes to run core OpenStack Services. The other techniques mentioned basically start dividing the AZ into cells, regions, or aggregates. Many people choose to have two independent AZ's so that workload can be run independently. Depending on your requirements you may go one way or another.