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Cluster Architecture

Redundancy and restart capability is provided by clustering the JS7 products for automated fail-over as follows:

• The JOC Cockpit can be operated for an active-passive cluster with one active instance and any number of passive instances.
  • Fail-over is handled automatically within 60s between cluster members by the JS7 - Cluster Service.
  • The JOC Cockpit cluster relies on a persistence layer provided by the JS7 - Database.
• The Controller implements an active-passive cluster with one active instance and one passive instance.
  • The Controller implements clustering and journaling by itself and does not require additional products such as a DBMS, see JS7 - Controller Cluster.
  • Cluster members couple and synchronize automatically. Fail-over time is typically around 3s.
• The Agent offers both an active-passive cluster and an active-active cluster, see the JS7 - Agent Cluster article.
  
  

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Communication

Asynchronous communication is based on the fact that messages are sent to a partner product without relying on the availability of the given productt: it is neither guaranteed that a message is received by its recipient nor can be assumed that the recipient will be able to respond in good time.

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