The core object is an abstraction that allows application access to backend storage cached by a cache. It provides API for submitting I/O requests, which are handled according to current cache mode and other cache and core configuration parameters. During normal cache operation the backend storage is exclusively owned by the cache object, and application should never access it directly unless the core is removed from the cache. That’s it, using the core API is the only proper way of accessing the data on the backend storage.
