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If you want to represent many HW or SW H/W or S/W elements as resources, you need to define the order of operation for them.
For instance, the IP address does not mean anything without going through the physical network adapter phase.
Also, without running the DB engine service, you cannot run a DB connection client.
The logical time order as discussed here is defined as a hierarchy relationship between a parent and a child in MCCS.The parent resource is above the child resource.
When you start a group in MCCS, it will start going online from the bottom to the top.
The parent resource can go online only after all the child resources go online. When you terminate a group, it will start going offline from the top to the bottom.

 

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[Figure] Online/Offline Sequence of Dependent Resources When Starting or Terminating a Group


Dependency Configuration

o To define this dependency among resources, configure this link in the ‘Resource Dependency’ view.

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In MCCS, you can configure the dependency relationship of resources by using a tree.
From the above screen, we can find out about the dependency relationship among resources.
The network address resource as a parent depends on the NIC resource as its child. The application resource as a parent depends on the network address resource as its child.
MCCS performs a failover on a group basis. Thus, all the resources within a group should be connected in this dependency relationship and they need to be put into a single group before we can provide meaningful service.
If we set two resources as a parent and an child, we can see it as two vertical levels. The max level can be checked in the 'MaxDependencyLevel' value in the group attribute menu.


[Figure] Setting Link

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