...
To define this dependency among resources, configure this link in the "Resource Dependency" view from detailed information panel of MCCS console.
[Figure] Dependency relationship
...
You can simply configure the dependency link of these resources in a tree form.You can see the dependency among resources intuitively from the view above.
The IP address resource as a parent depends on the NIC resource as its child. The application resource as a parent depends on the IP address resource as its child.
Therefore, some resources as like IP address of above example can be both child and parent relatively.
As described before, When a single resource is failed MCCS failover all of the resources in a group. Therefore
Therefore, when these are linked to one another as dependency rule and tied up together as a group, they can provide proper application service.
When you configure parent-child dependency link between two resources, there are 2 levels and the maximum level can be checked on value of "MaxDependencyLevel" of group attribute.
Link
[Figure] Setting Link
...
| Warning |
|---|
For linking process, first selected resource is parent resource and the one selected later is the child resource. |
Unlink
[Figure] Setting Unlink
...
- When you unlink the dependency, select "Select" icon from the "Palette".
- Select a dependency link to delete.
- On the selected link, right click with your mouse button and select the "Unlink" button from pop up menu and click "OK" button.
Dependency
...
settings
[Figure] Edit DependancyType
You can review and edit a dependency attribute when you select a dependency among resources.
There are "OnlineDependency" and "OfflineDependency" in the dependency attribute.
This is applied when you bring online and take offline a resource within "Restartlimit". (For more details about Restartlimit, Please refer to "Chapter 7 Resource" in this manual.)
...
For an instance, database service like MS-SQL or Oracle is not running properly without disk which contains data records. Therefore
Therefore, both resources are dependent on each other with the database service being the parent and the disk becoming the child resource.
If a client needs an IP address for accessing database, both resources are dependent on each other with the database service being the parent and the IP address being the child.
On the basis of the dependency rule, MCCS will bring online the database service after checking whether the IP address and disk resources were brought online properly when the group is brought online.
Accordingly, database service must depend on both IP address and disk resources at the same time to provide proper service.
...