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A failover group is a group that contains the resource that can be run at a single node at a time.
A failover group switches to the standby node when the main resource is failed. The resource in this group only operates runs at the operating available nodes.
For instance, a virtual IP address cannot be used at the operating active node and the standby node at the same time. In addition, if a virtual IP address causes troubles, it will switch service to the standby node.

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A parallel group is a group composed of the resources that can be run at more than one node at the same time.
A parallel group does not failover.In general, the resource containing applications made of cluster is online at the operating active node and offline at the standby node.
However, if you use a parallel group, you can start, monitor or terminate and stop the designated application at the both nodes.
For instance, if the both nodes operate the backup software and you register it as the resource managed in a cluster, you can run the backup software at the both nodes at the same time. (But, the application should be run at multiple nodes in parallel.)

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