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I think you've got a wrong idea on what Cinder actually does.

Your compute nodes will need to access the SAN in order to attach volumes exposed by Cinder. Cinder will not act as a proxy for those volumes. It will just make sure that the volumes are visible on the compute node side, returning the information required so that the Nova can connect those volumes and attach them to VMs on a passthrough basis.

Regards, Lucian