US Patent 9396243 Hash-based replication using short hash handle and identity bit

In one aspect, a method includes sending a first short hash handle and a first identity bit associated with the first short hash handle to a replication site, determining if a second hash handle is identical to the first short hash handle, determining if a second identity bit associated with the second short hash handle at the replication is set if the second short hash handle is identical to the first short hash handle and using the second hash handle to identify the data if the second identity bit being is set. The first short hash handle is an identifier of data stored on a disk.