EMC Symmetrix Remote Data Facility (SRDF) Asynchronous Replication option -

SRDF/Asynchronous Replication (SRDF/AR) option enables rapid disaster restart over any distance with a two-site single-hop option using SRDF/DM in combination with TimeFinder, or a three-site multi-hop option using a combination of SRDF/S, SRDF/DM, and TimeFinder.

SRDF/AR single-hop provides remote disaster restart at the secondary site with low data-loss exposure. SRDF/AR multi-hop provides long-distance remote disaster restart with zero data loss achievable at the "out-of-region" site.