votequorum_setexpected(3) [debian man page]

VOTEQUORUM_SETEXPECTED(3)			    Corosync Cluster Engine Programmer's Manual 			 VOTEQUORUM_SETEXPECTED(3)

NAME

       votequorum_setexpected - Sets the expected votes for the cluster

SYNOPSIS

       #include <corosync/votequorum.h>

       int votequorum_setexpected(votequorum_handle_t handle, int expected_votes);

DESCRIPTION

       The  votequorum_setexpected  function  is  used to change the expected votes in the cluster. Expected votes is used to calculate quorum and
       should normally be the total number of votes that will exist when all the expected nodes are joined. Quorum will usually be  half  of  this
       (rounded up).
       It is not possible to set expected votes up so that it makes the cluster inquorate using this command.

RETURN VALUE

       This call returns the CS_OK value if successful, otherwise an error is returned.

ERRORS

       The errors are undocumented.

SEE ALSO

       votequorum_overview(8), votequorum_initialize(3), votequorum_finalize(3), votequorum_dispatch(3), votequorum_fd_get(3),

corosync Man Page						    2009-01-26						 VOTEQUORUM_SETEXPECTED(3)

VOTEQUORUM_OVERVIEW(8)				    Corosync Cluster Engine Programmer's Manual 			    VOTEQUORUM_OVERVIEW(8)

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 reboot-
       ing 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_con-
       text_get(3), votequorum_context_set(3),

corosync Man Page						    2009-01-26						    VOTEQUORUM_OVERVIEW(8)