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Hi,

1) That hardware would probably run something like Devstack or Packstack - https://www.rdoproject.org/install/quickstart/ - just fine.

2) No, you don't need a second CPU to run DHCP - if you go the single-node install route, that's all built-in.

3) I don't know of any documentation that's out there for anything that old. It looks to me like Mirantis's documentation goes back to Fuel 5.0 (Icehouse) - https://docs.mirantis.com/fuel/fuel-5.1/ - and Red Hat's documentation goes back to 2.0 (Folsom) - https://access.redhat.com/documentation/en/red-hat-openstack-platform/?version=2 . As of today, there's no official support for either of those though.

Generally, I wouldn't suggest anyone attempt to install anything older than Icehouse. The newer releases can actually have support, and are far, far more stable and feature-rich than Essex.