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• The terms Active Controller Instance and Standby Controller Instance are often more significant, regardless of whether it is the Primary or Secondary Controller Instance which is active.
• A Controller implements an active-passive cluster, however, the term passive is misleading as the Standby Controller Instance is not passive at all but records any order state transitions occurring in the Active Controller Instance. Both Controller instances hold a journal of order state transitions that is actively synchronized. Fail-over and switch-over will occur only if both Controller instances' journals are in sync.
• The Cluster presents itself as a single unit to the outside world, i.e. to JOC Cockpit and to Agents.
  • Any operations performed in JOC Cockpit are automatically applied to the Active Controller Instance.
  • At any point in time only one Controller instance is active and the other instance is in standby mode.

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