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       votequorum_overview - Votequorum Library Overview


       The  votequuorum  library is delivered with the corosync project. It is
       the external interface to the vote-based quorum service.  This  service
       is  optionally  loaded  into  all  ndes  in a corosync cluster to avoid
       split-brain situations. It does  this  by  having  a  number  of  votes
       assigned  to  each  system in the cluster and ensuring that only when a
       majority of the votes are present, cluster operations  are  allowed  to

       The library provides a mechanism to: * Query the quorum status

       * Get a list of nodes known to the quorum service

       * Receive notifications of quorum state changes

       * Change the number of votes assigned to a node

       * Change the number of expected votes for a cluster to be quorate

       * Connect an additional quorum device to allow small clusters to remain
       quorate during node outages.

       votequorum reads its configuration from the objdb. The  following  keys
       are read when it starts up:

       * quorum.expected_votes
       * quorum.votes
       * quorum.quorumdev_poll
       * quorum.disallowed
       * quorum.two_node

       Most  of those values can be changed while corosync is running with the
       following exceptions: quorum.disallowed cannot be changed, and two_node
       cannot  be  set  on-the-fly, though it can be cleared. ie you can start
       with two nodes in the cluster and add a third without rebooting all the


       This software is not yet production, so there may still be some bugs.


       votequorum_initialize(3), votequorum_finalize(3), votequorum_fd_get(3),
       votequorum_dispatch(3),                      votequorum_context_get(3),