3.5.1 Matrix Server Administration Guide

Chapter 14: Configure Device Monitors 248

1. Matrix Server runs the Stop script on all servers where the shared

device or virtual host should be inactive.

2. Matrix Server waits for all Stop scripts to complete.

3. Matrix Server runs the Start script on the server where the virtual host

or shared device is becoming active.

The

SERIAL setting considers events and takes precedence over the

setting for Event Severity.

PARALLEL. Matrix Server does not enforce the strict ordering sequence

for Stop and Start scripts. The scripts run in parallel across the matrix as a

shared device or virtual host is in transition.

The

PARALLEL configuration can speed up failover time for services and

devices that do not depend on strict ordering of Start and Stop scripts.

Assuming that it is safe to run the scripts in parallel (which depends on

your application), this setting can also increase the chances of a successful

failover because Matrix Server does not have to wait for the failing node

to finish running its Stop script.

To configure script ordering from the command line, use this option:

--ordering serial|parallel

Virtual Hosts

The Virtual Hosts tab lets you specify any virtual hosts that you want to

fail over if the device fails. (By default, no virtual hosts will fail over.) If

you want all virtual hosts to be dependent on the device monitor and to

fail over if the device fails, check “Select All Virtual Hosts.”