Abstract: Embodiments are provided for enhancing storage efficiency in a de-duplication enabled storage system. Metadata of a shared-nothing clustered file system is scanned, and a first state of the storage system is determined. One or more cores are located from the metadata. Each core includes a grouping of objects having a minimum coreness. An arrangement of the located cores is optimized to improve global de-duplication efficiency by evaluating the objects of each core, identifying respective nodes in the storage system to maintain each core for de-duplication efficiency based on the evaluation, and re-arranging one or more of the evaluated objects in the storage system.

Abstract: Embodiments are provided for enhancing storage efficiency in a de-duplication enabled storage system. Using one or more de-duplication metadata repositories local to respective nodes of a storage system, objects are pre-processed in each node. The pre-processing includes deriving a coreness of each object, and grouping the objects into respective cores based on coreness. Each object of a core has at least a minimum coreness. In response to receiving an object request from a target node, the request is iteratively assessed by locating a first core comprising the requested object, calculating a size of the located first core, and identifying a transfer group based on the extracted size. The transfer group is transferred to the target node.