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Using MSCS 61
Dependent Resources
A dependent resource requires—or depends on—another resource to operate. For example, if a
Generic Application resource requires access to clustered physical storage, it would depend on a
physical disk resource. A resource can specify one or more resources on which it is dependent; it
can also specify a list of nodes on which it is able to run.
The following terms describe resources in a dependency relationship:
•
Dependent resource
— A resource that depends on other resources (the dependencies).
•
Dependency
— A resource on which another resource depends.
•
Dependency tree
— A series of dependency relationships such that resource A depends on
resource B, resource B depends on resource C, and so on.
Resources in a dependency tree obey the following rules:
– A dependent resource and all of its dependencies must be in the same group.
– The Cluster Service takes a dependent resource offline before any of its dependencies are
taken offline and brings a dependent resource online after all its dependencies are online,
as determined by the dependency hierarchy.
Setting Resource Properties
Using the resource Properties dialog box, you can perform the following tasks:
• View or change the resource name
• View or change the resource description and possible owners
• Assign a separate memory space for the resource
• View the resource type, group ownership, and resource state
• View which node currently owns the resource
• View pre-existing dependencies and modify resource dependencies
• Specify whether to restart a resource and the settings used to restart the resource (if required)
• Check the online state of the resource by configuring the
Looks Alive
and
Is Alive
polling
intervals in the Cluster Service
• Specify the time requirement for resolving a resource in a pending state (
Online
Pending
or
Offline Pending
) before the Cluster Service places the resource in
Offline
or
Failed
status
• Set specific resource parameters
The General, Dependencies, and Advanced tabs are the same for every resource. Some resource
types support additional tabs.
Properties of a cluster object should not be updated on multiple nodes simultaneously. See the
MSCS online documentation for more information.
se500wbk1.book Page 61 Thursday, June 16, 2005 4:19 PM