Provided by: corosync_1.4.2-2_amd64 bug

NAME

       votequorum_overview - Votequorum Library Overview

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 proceed.

       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 nodes.

BUGS

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

SEE ALSO

       corosync-quorumtool(8),         votequorum_initialize(3),          votequorum_finalize(3),
       votequorum_fd_get(3),          votequorum_dispatch(3),          votequorum_context_get(3),
       votequorum_context_set(3),