A computer implemented method, system, and computer program product for use in replication comprising calculating a set of signatures for each of a set of LUNs on a production site, calculating a set of signatures for each of a set of LUNs on a replication site, comparing the set of signatures to determine a mapping for the set of LUNs on the production site to the set of LUNs on the replication site, and matching a the set of LUNs on the production site to the set of LUNs on the replication site.