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controller requires cinder backend access


First of, I am using CentOS 7 with Openstack Pike installed on top. My topology is as follow:

Nova, Glance, Cinder, Keystone and Horizon installed on a Controller node which is a Virtual Machine running on ESXi. I have a compute node running the Nova service that is connected through FC to an storage. What I'm trying to do is force the users to create a volume and install the OS on that volume from an ISO loaded on glance. When I try to do that, the instance creation throws an error saying that the controller is not connected to the storage solution but I don't see why it would need to be connected, since I want the compute to use the storage (EMC VNX).

If I use an ephemeral image, the instance gets created and later on I can attach a volume from the storage. However, that is not the desire solution as I want the users to boot directly from the SAN.

Should I move the Cinder services to the compute node instead? Any explanation as to why the controller is trying to access the storage? No way I can provide access since the controller is a VM hosted on VMware itself.