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A cluster is a group made set of nodes composited of multiple resource groups such as failover or parallel groups.
A cluster is at the top of MCCS configuration and contains all the groups. MCCS's basic configurations are managedsingle or multiple groups in there. This manages HA configuration.

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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 managed resource is failed. The resource in this group only runs at the available nodes.
For instance, a virtual IP address cannot be used at the active node and the standby node at the same time. In addition, if a virtual IP address causes troubles, it will switch service failover the group to the standby node.

Support Parallel Group

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 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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