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Full Discussion: Ha mailserver, is possible active/active with "constant" connection?
Top Forums UNIX for Advanced & Expert Users Ha mailserver, is possible active/active with "constant" connection? Post 303045628 by hicksd8 on Saturday 4th of April 2020 02:09:53 PM
Old 04-04-2020
You problem is with network timeout settings; either the cluster or the clients.

Manually shutting down one of the cluster nodes may not give you the same result as a true CPU/power/whatever failure because the cluster software suite will probably see you do that. It would be better to simply pull out the RJ45 network connection to one of them simulating a network connection failure.

Anyway, the point is that a cluster failover takes time. During this time the virtual ip address is switched from one node to the other. Depending on the cluster suite this will take seconds/minutes. The fact that the client will reconnect to the surviving cluster node after you restart it proves that, had it waited long enough, it would have been able to reconnect on its own.

So the solution is to either (1) configure the cluster to failover faster, or (2) increase the timeout that clients will wait before giving up. That means that a new connection to the virtual ip address can be made before the configured timeout period ends.
 

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LEARN ABOUT OPENSOLARIS

scversions

scversions(1M)						  System Administration Commands					    scversions(1M)

NAME

       scversions - Sun Cluster version management

SYNOPSIS

       scversions [-c]

DESCRIPTION

       Note -

	 Beginning  with  the Sun Cluster 3.2 release, Sun Cluster software includes an object-oriented command set. Although Sun Cluster software
	 still supports the original command set, Sun Cluster procedural documentation uses only the object-oriented command set. For more  infor-
	 mation about the object-oriented command set, see the Intro(1CL) man page.

       The  scversions	command  commits  the cluster to a new level of functionality after a rolling-upgrade to new Sun Cluster software. With no
       arguments, the scversions command prints a message indicating whether a commitment is needed.

OPERANDS

       The following operands are supported:

       -c	    Commit the set of nodes that are currently active members of the cluster to the highest possible level of functionality.

		    When you upgrade a node (either through upgrade to a new release of the product or by application of a patch) and boot it back
		    into  the  cluster, some of the internal protocols on that node might have to run at lower versions in order to cooperate cor-
		    rectly with other nodes in the cluster.  When the cluster is in this state, some administrative actions might be disabled  and
		    some new functionality introduced in the upgrade might be unavailable.

		    When  you  run  this  command once from any node after all nodes are upgraded, the cluster switches to the highest versions of
		    internal protocols possible. Assuming that all nodes have the same Sun Cluster software installed at that time, all new  func-
		    tionality becomes available and any administrative restrictions are removed.

		    If	a  node that has not been upgraded is an active member of the cluster at the time you run the -c option to scversions, the
		    command has no effect because the cluster is already running at the highest possible level of functionality.

		    If a node has not been upgraded and is not an active member of the cluster when you run the -c option to scversions (for exam-
		    ple,  if  that  node is down for maintenance), the internal protocols of the cluster are upgraded to the highest possible ver-
		    sions.  You might have to upgrade the node that was not an active member of the cluster to enable it to rejoin the cluster.

EXIT STATUS

       0	    Success

       non-zero     Failure

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsczu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       scinstall(1M)

Sun Cluster 3.2 						    17 Aug 2007 						    scversions(1M)
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