The All-in-one Duplex (AIO-DX) deployment option provides a pair of high
availability (HA) servers with each server providing all three cloud functions
(controller, worker, and storage).

An AIO-DX configuration provides the following benefits:

* Only a small amount of cloud processing and storage power is required
* Application consolidation using multiple containers or virtual machines on a
  single pair of physical servers
* High availability (HA) services run on the controller function across two
  physical servers in either active/active or active/standby mode
* A storage back end solution using a two-node CEPH deployment across two servers
* Containers or virtual machines scheduled on both worker functions
* Protection against overall server hardware fault, where

  * All controller HA services go active on the remaining healthy server
  * All virtual machines are recovered on the remaining healthy server

.. note::

   If you are behind a corporate firewall or proxy, you need to set proxy
   settings. Refer to :doc:`/configuration/docker_proxy_config` for
   details.

.. figure:: /deploy_install_guides/r5_release/figures/starlingx-deployment-options-duplex.png
   :scale: 50%
   :alt: All-in-one Duplex deployment configuration

   *Figure 1: All-in-one Duplex deployment configuration*