Configuring Resource Constraints; Specifying Resource Failover Nodes - Novell SUSE LINUX ENTERPRISE SERVER 10 SP2 HEARTBEAT Manual

4.3 Configuring Resource Constraints

Resource constraints let you specify which cluster nodes resources will run on, what
order resources will load, and what other resources a specific resource is dependent on.
For information on configuring resource constraints, see Constraints
linux-ha.org/ClusterInformationBase/SimpleExamples] on the
High Availability Linux Web site.
4.4 Specifying Resource Failover
Nodes
Cluster resources will automatically fail over to another node in the cluster in the event
of a software or hardware failure. If you have more than two nodes in your cluster, the
node a particular resource fails over to is chosen by the Heartbeat software. If you want
to choose which node a resource will fail over to, you must configure a location con-
straint for that resource.
1 Start the HA Management Client and log in to the cluster as described in
Section 4.1, "Graphical HA Management Client"
2 Select the desired resource or group, select Resources > Add New Item, or
click the + button.
3 Choose Location as the resource item type, then click OK.
4 Specify the ID of the resource constraint. The resource name for the resource
you selected should already be displayed in the Resource field.
5 Click OK to add the constraint. The score will automatically be set to 0 by
default to avoid unwanted effects caused by an incomplete rule.
Score indicates the value you are assigning to this resource constraint. Con-
straints with higher scores are applied before those with lower scores. By
creating additional location constraints with different scores for a given re-
source, you can specify an order for the nodes that a resource will fail over
to.
(page 29).
Configuring and Managing Cluster Resources
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