JS7 JobScheduler

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  • If the Cluster Watch  is terminated at the same time as a failed Active Controller Instance then no fail-over can occur.
  • If the Cluster Watch is terminated at the same time as one of the Controller instances then the Controller Cluster cannot start up as this requires operational readiness of the Cluster Watch.
  • A Cluster Watch that is started after failure of the Active Controller Instance is disqualified from casting its vote as it has no knowledge of whether the Controller instances' journals are in sync.

High Availability Setup

The above explanations suggest that for HA setup on For high availability setup with two server nodes the following distribution of active and standby JS7 products is should be applied:

Server 1Server 2
Active JOC Cockpit Instance
Active Controller

Standby JOC Cockpit Instance

Standby Controller Instance
Standby JOC Cockpit
Active Controller Instance

Cluster Operations

Cluster operations include an automated fail-over and a manual switch-over of the Active Controller Instance.

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