Efficient replication using assistance from a secondary node involves in
one embodiment modifying data of a data volume at a primary node to
create modified data. The primary node transmits the modified data to a
first secondary node, wherein the first secondary node comprises a first
replica of the data volume. The first secondary node receives and
processes the modified data to generate processed data. The first
secondary node transmits the processed data to the primary node. The
primary node, in turn, receives and transmits the processed data to a
second secondary node, wherein the second secondary node comprises a
second replica of the data volume.