All... apologies for the random post... sometime ago I created a simple patch set for NBD to directly utilize the RDMA capabilities of Infiniband via the Sockets Direct Protocol. I've just now got around to posting the patch set(s) publicly. There are certainly other options for using remote block devices and Infiniband, but if figured I would offer up the patch set anyway. Check it out here:: http://code.google.com/p/sdp-nbd/ cheers john