Abstract: A method for maintaining intelligent write ordering in an asynchronous data replication system is disclosed. In one embodiment, such a method includes performing the following, in order, for each extent of each rank of the primary storage device: (1) determining which primary volume the extent is associated with on the primary storage device; (2) if the primary volume that is associated with the extent is in a mirroring relationship with a corresponding secondary volume on the secondary storage device, scanning an out-of sync bitmap associated with the primary volume; and (3) sending, from the primary volume to the secondary volume, tracks in the extent having corresponding bits set in the out-of sync bitmap. A corresponding system and computer program product are also disclosed.