linux/Documentation/blockdev/nbd.txt
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   1                      Network Block Device (TCP version)
   2                                       
   3   What is it: With this compiled in the kernel (or as a module), Linux
   4   can use a remote server as one of its block devices. So every time
   5   the client computer wants to read, e.g., /dev/nb0, it sends a
   6   request over TCP to the server, which will reply with the data read.
   7   This can be used for stations with low disk space (or even diskless)
   8   to borrow disk space from another computer.
   9   Unlike NFS, it is possible to put any filesystem on it, etc.
  10
  11   For more information, or to download the nbd-client and nbd-server
  12   tools, go to http://nbd.sf.net/.
  13
  14   The nbd kernel module need only be installed on the client
  15   system, as the nbd-server is completely in userspace. In fact,
  16   the nbd-server has been successfully ported to other operating
  17   systems, including Windows.
  18
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