Cluster node configuration methods

 These are the available clustering node configurations

1. Active/Active – Traffic is directed to another existing node or balanced across all other nodes

2. Active/Passive – A complete new node is served when primary node fails

3.  N+1 – Serving a complete new node in the place of primary node and the new node    in the cluster must be capable of handling any services which the primary node handled with/without any special additional software.

4. N+M – Here more than one dedicated nodes are served for handling failovers.
This   may require high cost and maintenance.

5. N-to-1 – Here the backup node is serving temporarily until the primary node is brought back online. Then the running services are transferred to primary node.

6. N-to-N — A combination of Active/Active and N+M clusters, N to N clusters.

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