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I am planning to deploy OpenStackHA which 28 servers, which is quit a lot for me. So i am thinking to put up few of roles like rabbitmq, mysql, cloud controller, horizon on virtual machines on KVM might. And ceph, network node and compute nodes on physical servers.
Is it possible to implement OpenStack in such a way? Any precautionary steps that should be taken?

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This is completely possible and a valid solution to paring down the number of machines needed for an HA deployment of OpenStack. The latest version of MAAS, available in the cloud-archive, has support for "vMAAS" or Virtual MAAS, which gives MAAS the power to drive virtual machines in addition to physical ones.

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