Hi @Anap79, 

CoreOS is supported for every driver. This is part of our qualification process for Openshift : https://dell.github.io/csm-docs/docs/csidriver/#supported-operating-systemscontainer-orchestrator-platforms

Fedora CoreOS qualification came from a customer who has an "home baked" Kubernetes on top of Fedora CoreOS.

If you are looking for the qualification of CSI Unity for that particular platform, please reach out to me in PM.

Thanks.