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Do I need to have a separate server for cinder-volume if ceph is used?

The previous administrator has made several separate cinder-volume servers on VMs, but I don't understand why this is necessary, and I can't find information where someone could recommend doing this when only ceph is used. If I configure cinder-volume on the controllers, can it adversely affect performance of Cinder or controllers? I want to remove cinder-volume VMs, if they aren't needed.