3.1.2 Matrix Server Administration Guide

Chapter 13: Configure Device Monitors 175

determines the placement of the associated virtual hosts. For example, if a

probe fails on the primary server for a virtual host, the virtual host may

fail over to a backup server. See “Device Monitors and Failover” on page

176 for details about where a device monitor is active.

Custom device monitors can be configured to be either multi-active or

single-active. With a single-active configuration, the monitor is active

only on the primary node.

SHARED_FILESYSTEM Device Monitor

If you have created a virtual host for applications that obtain their data

from a

PSFS filesystem, or if you just want to monitor access to a PSFS

filesystem, you can use the

SHARED_FILESYSTEM device monitor to

ensure that the filesystem is healthy and the virtual host remains

available.

SHARED_FILESYSTEM device monitor is associated with a specific

PSFS filesystem. The monitor probes the filesystem at periodic intervals to

determine the filesystem health. The probe attempts to open and read a

file located on the filesystem. When you configure the monitor, you can

specify the file to be read, or you can let Matrix Server create a file for this

purpose.

SHARED_FILESYSTEM device monitor attempts to be active on each

server specified in its configuration.

The device monitor probe reports an

UP status for the filesystem only if it is mounted and file content can be

read from the filesystem.

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.