Question about HACMP for active-active mode Post: 302365516

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Operating Systems AIX Question about HACMP for active-active mode Post 302365516 by shockneck on Tuesday 27th of October 2009 09:38:38 AM

10-27-2009

Registered User

HACMP terminology changed now and then. Some terms were used with older HACMP versions 3 and 4, some came into existence with the current HACMP Version 5 while others ceased to exist. The same is true with certain functions/possibilities. IBM Speak itself can be a bit challenging but when you mix up words from different times you end up in a mess.

An active-active cluster has (at least) two nodes and two Resource Groups RG. So there is one RG per node and only during takeover/failover two RG are on one node. This is a very good setup because during normal operation the RG (its application) has its dedicated CPU/RAM/IO. Furthermore not everybody can afford running (i.e. paying for) two servers but using only one. It does not at all mean that there is no takeover / failover possible.

A concurrent HACMP RG means Oracle RAC. I am not aware of another application that is able to run as a concurrent HACMP cluster. While there are two or more nodes active at a time this is not usually called an active-active configuration as no takeover is involved. In a concurrent cluster a node may die but the other(s) keep on working regardless.

Cascading / rotating is related to RG behaviour. If there is a fixed order of how the RG is taken over from node to node (usually in a Cluster with 3+ nodes that are different so that using certain nodes is perferable) this is a cascading behaviour. If the RG does not care on what node it is active, i.e. it can be active on any node a rotation of the RG might be OK.

Concurrent volume group are rarely used these days. Today you are likely to use Enhanced Concurrent Mode VG. And Oracle RAC can use an ECM VG in a Concurrent Cluster.

As you might have guessed by now already: some reading might be required. If you are an absolute beginner with HACMP you might start by reading the HACMP cookbook from December 2005 followed by the PowerHA cookbook (yes, the name changed with 5.5 ....) from September 09.

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LEARN ABOUT CENTOS

votequorum_qdevice_master_wins

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

NAME

       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)