You can deploy VMware Integrated OpenStack in compact deployment mode. Compact deployment mode requires significantly fewer hardware resources and memory than HA mode.
An VMware Integrated OpenStack deployment with compact architecture requires the least amount of resources to get started. The product architecture in compact mode requires one ESXi host and a minimum of 120 GB of storage.
As opposed to the HA architecture, the compact architecture has only one instance of controller, message queue, and database. As shown in the figure below, all of the components are deployed in two VMs.
If you are comfortable protecting the virtual machine by making regular backups, then you can use compact architecture in production. If you are not comfortable making regular backups, the compact architecture is good for learning, proof of concept, and evaluating new versions of VIO.