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HA hardware for small numbers of virtual machines

I need to deploy two apps on cloud foundry.

Both are rails 4 web apps relying on postgis.

I'd like to be able to deploy CloudFoundry on Openstack so that both apps can scale up to 10 medium virtual machines (20 vcores and 40 GB of RAM).

I'd like to have High Availability so I'd start with two controllers and two compute.

For the two controllers I'd opt for two 1U servers with 1 quad core CPU, 16 GB RAM, 2 3TB HD and 2 1 GB NICs. For the two compute I'd opt for two 2U servers with 2 6 core CPU, 64 GB RAM, 4 2TB HD and 2 1 GB NICs.

Is it a good hardware choice for the envisioned scenario?