Sun Cluster 3.1 10/03 Data Services Developer's Guide

Monitor_start Method

The RGM calls the Monitor_start method to launch the dns_probe method after the sample data service is brought online.

This section describes the major pieces of the Monitor_start method for the sample application. This section does not describe functionality common to all callback methods, such as the parse_args() function and obtaining the syslog facility, which are described in Providing Common Functionality to All Methods.

For the complete listing of the Monitor_start method, see Monitor_start Method.

Monitor_start Overview

This method uses the process monitor facility (pmfadm) to launch the probe.

Starting the Probe

The Monitor_start method obtains the value of the Rt_basedir property to construct the full path name for the PROBE program. This method launches the probe using the infinite retries option of pmfadm (-n -1, -t -1), which means if the probe fails to start, PMF tries to start it an infinite number of times over an infinite period of time.

# Find where the probe program resides by obtaining the value of the
# RT_BASEDIR property of the resource.
RT_BASEDIR=`scha_resource_get -O RT_BASEDIR -R $RESOURCE_NAME -G \

# Start the probe for the data service under PMF. Use the infinite retries 
# option to start the probe. Pass the resource name, type, and group to the 
# probe program. 
pmfadm -c $RESOURCE_NAME.monitor -n -1 -t -1 \