Embodiments for, in a shared storage environment, managing data replication between first and second sites of a distributed computing environment by one or more processors. Based on an identified data block-set for replication, a unique metadata map is generated as a computed snapshot of the identified data block-set, the metadata map accounting for a predetermined block-size for transfer. The unique metadata map is transferred to the second site. The second site adds the unique metadata map to a global metadata repository.