Abstract—Many science facilities, such as the Department of Energy’s Leadership Computing Facilities and experimental facilities including the Spallation Neutron Source, Stanford Linear Accelerator Center, and Advanced Photon Source, produce massive amounts of experimental and simulation data. These data are often shared among the facilities and with collaborating institutions. Moving large datasets over the wide- area network (WAN) is a major problem inhibiting collabora¬tion. Next-generation, terabit-networks will help alleviate the problem, however, the parallel storage systems on the end- system hosts at these institutions can become a bottleneck for terabit data movement.