Managing Serviceguard 11th Edition, Version A.11.16, Second Printing June 2004

Understanding Serviceguard Software Components
How the Package Manager Works
Chapter 382
You can specify a registered resource for a package by selecting it from
the list of available resources displayed in the Serviceguard Manager
Configuring Packages. The size of the list displayed by Serviceguard
Manager depends on which resource monitors have been registered on
your system. Alternatively, you can obtain information about registered
resources on your system by using the command
/opt/resmon/bin/resls. For additional information, refer to the man
page for resls(1m).
Using the EMS HA Monitors
The EMS HA Monitors, available as a separate product (B5736DA), can
be used to set up monitoring of disks and other resources as package
dependencies. Examples of resource attributes that can be monitored
using EMS include the following:
• Logical volume status
• Physical volume status
•System load
• Number of users
• File system utilization
•LAN health
Once a monitor is configured as a package dependency, the monitor will
notify the package manager if an event occurs showing that a resource is
down. The package may then be failed over to an adoptive node.
The EMS HA Monitors can also be used to report monitored events to a
target application such as OpenView IT/Operations for graphical display
or for operator notification. Refer to the manual Using High Availability
Monitors (B5736-90022) for additional information.
Choosing Package Failover Behavior
To determine failover behavior, you can define a package failover policy
that governs which nodes will automatically start up a package that is
not running. In addition, you can define a failback policy that determines
whether a package will be automatically returned to its primary node
when that is possible.