NBD is a client and server
allowing one machine to serve a block device over a TCP connection to another
machine (currently, a Linux client). Think iSCSI, without all the
The NBD server included in the nbd-2.7.1 package does not
compile on non-Linux hosts, even though it doesn't need to do anything
fundamentally unportable. I needed to access a block device on an
OpenBSD machine, so I wrote a replacement NBD server.