Introduction

• The

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Cluster Roles

Roles include the Active Controller, the Standby Controller and the Witness.

digraph structs {
    # compound=true;
    rankdir=LR;

    node[shape="record"];  
 	ActiveWitness [label="<f0>Primary Witness\n   Active   ",shape="rectangle",style="filled",fillcolor="limegreen",fontname="Arial",fontsize="12pt"]

    node[shape="record"]; 
    ActiveController [label="<f1>Primary Controller\n   Active   ",shape="rectangle",style="filled",fillcolor="lightskyblue",fontname="Arial",fontsize="12pt"]

    node[shape="record"]; 
	StandbyController[label="<f2>SecondaryController\n   Standby   ",shape="rectangle",style="filled",fillcolor="lightgrey",fontname="Arial",fontsize="12pt"]

    subgraph normal_operation {
        fontname="Arial";
        fontsize="12pt";

        ActiveWitness:f0 -> ActiveController [label=" hold connection ",fontname="Arial",fontsize="10pt"]
		ActiveWitness:f0 -> StandbyController [label=" hold connection ",fontname="Arial",fontsize="10pt"]
		ActiveController:f1 -> StandbyController [label=" hold connection ",fontname="Arial",fontsize="10pt"]
		StandbyController:f2 -> ActiveController [label=" hold connection ",fontname="Arial",fontsize="10pt"]
    }
}

xx

...

• cluster architecture describes:
  • cluster operation
  • node distribution
  • site distribution

Anchor
cluster_architecture cluster_architecture

Cluster Architecture

• Download: JS7_JobScheduler_Cluster_Architecture.pptx
• Download: JS7_JobScheduler_Cluster_Architecture.pdf
• Use the links above if the document below does not display in your browser.
  
  

High Level Architecture

JS7 includes the following products:

• The JOC Cockpit, which is used to manage the JS7 - Inventory of scheduling objects, to monitor and control workflow execution and to access the JS7 - History.
• The Controller, which is used to orchestrate Agents, to deploy workflows and to pass orders for workflow execution to Agents.
• Agents, which are dedicated to a Controller and are used to execute workflows and jobs. Agents can act autonomously for workflows that execute all included jobs with the same Agent.
  
  

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JS7 products can be clustered:

• JOC Cockpit and Controller can each implement a passive cluster with an active node and a standby node.
• Agents can be operated standalone or as instances of a JS7 - Agent Cluster which implements active-passive or active-active scheduling.
  
  

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Controller Cluster Operation

A Controller Cluster offers restart capabilities for fail-over and switch-over:

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Controller Cluster of Two Nodes

Limited high availability is provided from a cluster using two nodes:

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Controller Cluster of Three Nodes

A number of disaster scenarios are covered when using a cluster of three nodes:

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Controller Cluster of Four Nodes

High availability for most disaster scenarios when loosing more than one node is covered by a cluster using four nodes:

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Director Agent Cluster Operation

The Director Agent Cluster works similarly to a Controller Cluster:

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Site Redundancy

Operating nodes for JS7 products from separate sites is a means to increase redundancy.

Redundancy of Two Active/DR Sites

Use of an Active Site and a DR Site allows the distribution of nodes for switch-over between sites:

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Redundancy of Three Active Sites

Use of three Active Sites offers improved redundancy for fail-over and switch-over:

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