Hi All, I am looking for hardware requirements (CPU, RAM, HDD) for installing a OpenStack HA cluster. So far, I gathered few references: - This article talks about CPU and HDD, but they do not comment on RAM. - https://docs.openstack.org/project-deploy-guide/openstack-ansible/ocata/over... - This article talks about CPU, RAM, and HDD, but it is quite old (2015) reference. - https://docs.huihoo.com/openstack/docs.openstack.org/ha-guide/HAGuide.pdf (Page 6) I am considering the cluster with: 3 Controller (for HA) + 1 Compute + 1 Storage. I have following questions: - What is the minimum hardware (CPU, RAM, HDD) requirement to install a OpenStack HA cluster? - Can we have 3 Controller nodes installed on 3 Virtual Machines or do we need 3 independent (bare metal) servers? - So in case of VM-based controllers, the cluster will be hybrid in nature. - I do not know if this is even possible and a recommended design. - Do we need the Platform Director node in addition to controller and compute/storage nodes? Thanks in advance. Anil.