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votequorum_overview(8) [centos man page]

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

votequorum_overview - Votequorum Library Overview OVERVIEW
The votequorum 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 nodes 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. BUGS
No known bugs at the time of writing. The authors are from outerspace. Deal with it. SEE ALSO
corosync-quorumtool(8), votequorum(5), votequorum_initialize(3), votequorum_finalize(3), votequorum_getinfo(3), votequorum_trackstart(3), votequorum_trackstop(3), votequorum_fd_get(3), votequorum_dispatch(3), votequorum_context_set(3), votequorum_context_get(3), votequo- rum_setexpected(3), votequorum_setvotes(3) corosync Man Page 2012-01-12 VOTEQUORUM_OVERVIEW(8)

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

votequorum_qdevice_master_wins - Sets or clears quorum device master_wins flag SYNOPSIS
#include <corosync/votequorum.h> int votequorum_qdevice_master_wins(votequorum_handle_t handle const char name, unsigned int allow); DESCRIPTION
The votequorum_qdevice_master_wins informs votequorum whether or not the currently registered qdevice subsystem supports 'master_wins' mode (default 0). This mode allows the qdevice to effectively take over the quorum calculations of votequorum. Any node with an active qdevice that also has master_wins set becomes quorate regardless of the node votes of the cluster. It is left up to the qdevice subsystem itself (not part of votequorum) to communicate across the nodes or otherwise provide some system of deciding which nodes will be part of the quo- rate cluster, if any. eg They may be the set of nodes that has access to a quorum disk. name The name of the currently registered quorum device on this node. This must match the existing name known to votequorum. allow 0 (the default) means that master_wins is not active on this node. 1 means that master_wins is active on this node. RETURN VALUE
This call returns the CS_OK value if successful, otherwise an error is returned. ERRORS
CS_ERR_TRY_AGAIN Resource temporarily unavailable CS_ERR_INVALID_PARAM Invalid argument CS_ERR_ACCESS Permission denied CS_ERR_LIBRARY The connection failed CS_ERR_INTERRUPT System call inturrupted by a signal CS_ERR_NOT_SUPPORTED The requested protocol/functuality not supported CS_ERR_MESSAGE_ERROR Incorrect auth message received CS_ERR_NO_MEMORY Not enough memory to completed the requested task SEE ALSO
votequorum_overview(8), votequorum_initialize(3), votequorum_finalize(3), votequorum_getinfo(3), votequorum_trackstart(3), votequo- rum_trackstop(3), votequorum_fd_get(3), votequorum_dispatch(3), votequorum_context_set(3), votequorum_context_get(3), votequorum_setex- pected(3), votequorum_setvotes(3), votequorum_qdevice_register(3), votequorum_qdevice_poll(3), votequorum_qdevice_update(3), corosync Man Page 2014-06-10 VOTEQUORUM_QDEVICE_MASTER_WINS(3)
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