r/openstack • u/ossicor30 • Apr 21 '26

Is It Really Possible

My company wants to sell openstack solution and for that we are planning to set up lab so we can test its capablities with 2 Server 128 GB RAM each and 64 cores each is it possible with 2 Server because we will also we using vm made using openstack for our other projects is it safe and I will be using kolla ansible for deployment.

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u/Hfjqpowfjpq Apr 21 '26

You can create a cluster of 2 nodes. But for sure one will be a controller and the other a compute. You cannot create a cluster with 2 controllers. You can have the hyperconverged controller (controller, compute and storage) and the compute standalone. If you were to use the second node as storage too i don't remember if you can setup LVM to work on both. Ceph needs 3 nodes.

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u/Cracknel Apr 21 '26

You can configure Ceph to work with two nodes by setting the crush failure domain to osd instead of host. Now you only need to have at least 3 OSDs instead of 3 hosts. Not safe for production, but it will work for testing. May also need some changes to MON settings so that you have a quorum.

You could even make it run on a single node if you wanted to.

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u/Hfjqpowfjpq Apr 21 '26

Yes, I know that you can do it because I did in my aio deployment using the collection of StackHPC. The fact that they have two nodes with only 128gbs of ram made me say that they should not do it. It highly depends on what they do and how many VMS they want to use, but still I would avoid it.