3.5.1 Matrix Server Administration Guide

Chapter 14: Configure Device Monitors 252

Set a Global Event Delay

A device monitor that is configured to be multi-active or to probe on

multiple servers can experience a global event, in which the shared

resource being monitored is reported to be down on all servers. When the

shared resource becomes active again, the monitor probe on each server

will report that the resource is up.

Typically a monitor instance on one server will report that the resource is

up before the instances on all of the other servers have completed their

probe operations. When this occurs, the virtual hosts (if any) that are

associated with this monitor can fail over to the server that first reports

that it is Up. When the monitors on the other servers report an Up status,

the virtual hosts can fail back to their original primary servers.

If you are experiencing unwanted failover/failback operations, you can

increase the Global Event Delay, which causes virtual hosts to wait for the

specified period of time before performing the failover. The delay should

provide enough time for all of the monitor instances to run the probe

operation and report that the shared resource has come back up, thus

preventing the failovers.

The Global Event Delay applies to all multi-probe or multi-active device

monitors and Export Group monitors configured in the matrix. To set the

Global Event Delay, select a device monitor on the Management Console,

right-click, and select Global Settings (or select Matrix > Device Monitor >

Global Settings).

Enable Global Event Delay. This feature is enabled by default.