A hardware-based mirroring agent that provides a LUN-based IO interface to remote host computers, including mirrored LUNs, implemented via remote data storage devices. In one embodiment, for example, the disclosure provides a method for polymerizing a monomer containing a plurality of electrophilic groups, wherein the method comprises contacting the monomer with a nucleophilic reagent in the presence of a guanidine-containing catalyst. The write enable pulse width control circuit and the write data path circuit together control a write operation to a memory cell. Tests may be periodically issued to the clients and to the intermediate nodes to measure and track performance and quality of the network connections. The divider is available in a number of different shapes and can be made as a single piece or as an inner divider with a transparent cover.