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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_REGISTER(3)			    Corosync Cluster Engine Programmer's Manual 		    VOTEQUORUM_QDEVICE_REGISTER(3)

votequorum_qdevice_register - Registers a new quorum device SYNOPSIS
#include <corosync/votequorum.h> int votequorum_qdevice_register(votequorum_handle_t handle, const char * name); DESCRIPTION
The votequorum_qdevice_register is used to register a new quorum device. A quorum device is an external way of adding votes to a small cluster. The quorum device is, in effect, a pseudo node in the cluster that provide votes based on some external device, usually a shared disk partition or perhaps a network router. This call creates the device but does not mark it active. votequorum_qdevice_poll must be called for the votes to be included in the quo- rum calculation. name is string containing an informative name for the quorum device. It is simply stored by votequorum and used in the display of corosync- quorumtool, it can be a maximum of 254 characters. The number of votes contributed by the quorum device is already known to votequorum, it is set in cmap quorum.device.votes and not by the device. Note that it is the responsibility of the quorum device subsystem (not provided as part of votequorum) to keep all nodes informed of the quorum device status. 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_unregister(3), votequorum_qdevice_poll(3), votequorum_qdevice_update(3), votequo- rum_qdevice_master_wins(3) corosync Man Page 2014-06-10 VOTEQUORUM_QDEVICE_REGISTER(3)
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