3.5.1 Matrix Server Administration Guide

Chapter 14: Configure Device Monitors 238

When you create a SHARED_FILESYSTEM device monitor, be sure to

configure the following advanced options:

• Virtual hosts. Select any virtual hosts that should fail over if the

monitor probe reports a

DOWN status for the filesystem.

• Servers. Select all servers that have mounted the filesystem and are

running the applications associated with the virtual hosts.

You might also want to create Start, Stop, or Recovery scripts to

customize the behavior of the monitor.

Disk Device Monitor

The DISK device monitor can be used to monitor a disk device. It

periodically attempts to read the first block of the specified disk partition

to determine whether the disk is operating normally.

Custom Device Monitor

A CUSTOM device monitor can be particularly useful when integrating

Matrix Server with a custom application. Custom monitors can be

configured to be either single-active or multi-active.

You must supply the probe script for the custom monitor. In the script,

probe commands should determine the health of the device as necessary.

If the device is operating normally, the probe script should exit with exit

status zero. If the device is not operating normally, the probe script

should exit with a non-zero exit status. Matrix Server will interpret the

non-zero exit status as a failure of the device, and take the appropriate

action.

See “Advanced Topics” on page 270 for information about developing

probe scripts for custom monitors and integrating monitors with custom

applications.

Device Monitors and Failover

When you create a device monitor, you specify a list of servers on which

the device monitor will operate. The servers are placed in order: primary,

backup #1, backup #2, and so on. ClusterPulse considers the status and