Overview of cluster environments
Cluster environments can be set up in many different configurations. This section describes the most popular cluster configurations.
Active/Active: Pool cluster resources
In an active/active configuration, each node is actively managing at least one resource and is configured as a backup for one or more resources in the cluster. Active/active is the most common form of a cluster environment.
Active/Passive: Fault tolerant
In an active/passive configuration, one node actively manages the resource.
The other node is only used if the primary node experiences a fault and the resource needs to failover. An active/passive cluster is a subtype of an active/active cluster.
Concurrent access
In a concurrent configuration, more than one node manages a resource. When a fault occurs, the resource continues to be managed by the other nodes.