HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

Online Reconfiguration of Generic Resources
Online operations such as addition, deletion, and modification of generic resources in packages
are supported. The operations that can be performed online are:
• Addition of a generic resource of generic_resource_evaluation_type set to
during_package_start, if the status of the generic resource is not 'down'.
Please ensure that while adding a generic resource, the equivalent monitor is available; if not
add the monitor while adding a generic resource.
• Addition of a generic resource of generic_resource_evaluation_type set to
before_package_start, whose status is 'up'.
• Deletion of a generic resource. Please ensure that while deleting a generic resource, the
equivalent monitor is also removed. However, if a common resource is being monitored across
multiple packages, then before removing the monitor ensure that the generic resource being
deleted is not configured in other packages that are also using this monitor.
• Modification of generic_resource_evaluation_type from before_package_start
to during_package_start or vice versa when the resource is 'up'.
• Modification of generic_resource_up_criteria specified for resources of evaluation
type before_package_start or during_package_start provided the new up criteria
does not cause the resource status to evaluate to 'down' (i.e., the current_value of the resource
still satisfies the new up_criteria).
• Modification of resource type from a simple resource to an extended resource is allowed only
if the generic_resource_evaluation_type is during_package_start in all the
running packages that currently use the resource.
Parameters for Configuring EMS Resources
NOTE: The default form for parameter names and literal values in the modular package
configuration file is lower case; for legacy packages the default is upper case. There are no
compatibility issues; Serviceguard is case-insensitive as far as the parameters are concerned. This
manual uses lower case, unless the parameter in question is used only in legacy packages, or the
context refers exclusively to such a package.
Serviceguard provides a set of parameters for configuring EMS (Event Monitoring Service) resources.
These are resource_name, resource_polling_interval, resource_start, and
resource_up_value. Configure each of these parameters in the package configuration file for
each resource the package will be dependent on.
The resource_start parameter determines when Serviceguard starts up resource monitoring
for EMS resources. resource_start can be set to either automatic or deferred.
Serviceguard will start up resource monitoring for automatic resources automatically when the
Serviceguard cluster daemon starts up on the node.
Serviceguard will not attempt to start deferred resource monitoring during node startup, but will
start monitoring these resources when the package runs.
The following is an example of how to configure deferred and automatic resources.
resource_name /net/interfaces/lan/status/lan0
resource_polling_interval 60
resource_start deferred
resource_up_value = up
resource_name /net/interfaces/lan/status/lan1
resource_polling_interval 60
resource_start deferred
resource_up_value = up
136 Planning and Documenting an HA Cluster