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existing NetApp data in OpenStack

Is there a way to use already existing data in a NetApp volume (no OpenStack involved) as read-only data in an OpenStack instance through cinder? As when I created a cinder node with NetApp backend, it creates new empty cinder-volumes but can not use pre-existing data.

I do not want to duplicate the data, as I am speaking of terribly big amounts of data. A simple NFS mount to the NetApp volume, so without use of Cinder, isn't possible due to security reasons.

Use case: Bring external users (customers) into our internal OpenStack cloud (instance) where they can process the existing read-only data and write it back to a different volume (also internal).

existing NetApp data in OpenStack

Is there a way to use already existing data in a NetApp volume (no OpenStack involved) as read-only data in an OpenStack instance through cinder? As when I created a cinder node with NetApp backend, it creates new empty cinder-volumes but can not use pre-existing data.

I do not want to duplicate the data, as I am speaking of terribly big amounts of data. A simple NFS mount to the NetApp volume, so without use of Cinder, isn't possible due to security reasons.

Use case: Bring external users (customers) into our internal OpenStack cloud (instance) where they can process the existing read-only data and write it back to a different volume (also internal).