linux/Documentation/admin-guide/blockdev/drbd/index.rst

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Distributed Replicated Block Device - DRBD
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Description
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  DRBD is a shared-nothing, synchronously replicated block device. It
  is designed to serve as a building block for high availability
  clusters and in this context, is a "drop-in" replacement for shared
  storage. Simplistically, you could see it as a network RAID 1.

  Please visit https://www.drbd.org to find out more.

.. toctree::
   :maxdepth: 1

   data-structure-v9
   figures