Ha mailserver, is possible active/active with "constant" connection? Post: 303045628

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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

04-04-2020

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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.

hicksd8

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LEARN ABOUT OPENSOLARIS

scds_fm_sleep

scds_fm_sleep(3HA)					 Sun Cluster HA and Data Services					scds_fm_sleep(3HA)

NAME

       scds_fm_sleep - wait for a message on a fault monitor control socket

SYNOPSIS

       cc [flags...] -I /usr/cluster/include file -L /usr/cluster/lib  -l  dsdev
       #include <rgm/libdsdev.h>

       scha_err_t scds_fm_sleep(scds_handle_t handle, time_t timeout

DESCRIPTION

       Thescds_fm_sleep() function waits for a data service application process tree that running under control of the process monitor facility to
       die. If no such death occurs within  the  specified  timeout period, the function returns SCHA_ERR_NOERR.

       If a data  service  application process tree death occurs, scds_fm_sleep() records SCDS_COMPLETE_FAILURE in the failure history and  either
       restarts  the process tree or fails it over according to the algorithm described in the scds_fm_action(3HA) man page. If a failover attempt
       is unsuccessful, a restart of the application is attempted.

       If an attempted restart fails, the function returns SCHA_ERR_INTERNAL.

       Note that if the failure history causes this function to do a failover, and the failover attempt succeeds, scds_fm_sleep() never returns.

PARAMETERS

       The following parameters are supported:

       handle		   The handle returned from scds_initialize(3HA).

       timeout		   The timeout period measured in seconds.

RETURN VALUES

       The scds_fm_sleep() function returns the following:

       0		   The function succeeded.

       nonzero		   The function failed.

ERRORS

       SCHA_ERR_NOERR		   Indicates that the process tree has not died.

       SCHA_ERR_INTERNAL	   Indicates that the data service application process tree has died and failed to restart.

       Other values		   Indicate the function failed. See scha_calls(3HA) for  the meaning of failure codes.

FILES

       /usr/cluster/include/rgm/libdsdev.h

	   Include file

       /usr/cluster/lib/libdsdev.so

	   Library

ATTRIBUTES

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

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

SEE ALSO

	scha_calls(3HA), scds_fm_action(3HA), scds_initialize(3HA), attributes(5)

Sun Cluster 3.2 						    7 Sep 2007							scds_fm_sleep(3HA)