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RSF-1 High Availability Cluster supports N+1 high availability cluster configurations to provide optimum HA configurations and to minimize hardware redundancy.
In a traditional Active/Passive cluster configuration, a redundant server is effectively standing idle until a fault on the main server has occurred at which point it becomes the active unit and restarts the failed service(s). In an Active/Active High Availability configuration, both nodes provide active services and in the event of either failing, the surviving node runs all active services. This configuration is optimal in terms of hardware usage but a drop in performance can result.
In an n+1 cluster configuration, similar to RAID-5 disk subsystem configurations, a single spare server can be used to provide protection for a number of active servers providing optimal performance with minimal hardware redundancy. In RSF-1 n+1 configurations, failed services can be restarted on the single spare server, or any other server in the cluster that it has been configured to run on allowing total flexibility with regards to performance and hardware redundancy.