The original Linux Network Block Device driver, created by Pavel Machek, has been enhanced for use in an industrial setting. Its networking code has been brought userside to allow secure connections and authentication over dedicated SSL/TCP links. The protocol itself now includes block request journalling and automatic fallover to working channels from dead channels; plus automatic reintegration of recovered links, asynchronous working for greater speed, striped communications and resource distribution, and other goodies designed to secure the driver against attacks and failures. We'll unpack the current device and its development history, how it can be used as part of a secure remote storage solution, and where and how it overcomes defects in the original driver.