Binary package “nbd-server” in ubuntu precise
Network Block Device protocol - server
Network Block Device (NBD) is a client/server protocol that
emulates a block device (such as a hard disk, a floppy, or a CD-ROM)
over the network, thus giving the system the ability to swap over the
network, or to use raw network disk space for other purposes.
However, writing to one Network Block Device from different clients
simultaneously is not recommended, and would probably result in data
loss. If you want multiple clients to share a remote resource, use a
network file system such as NFS or Coda.
This package provides the server binary for NBD.