webMethods Product Suite  | Complete Installation and Upgrade Information for Software AG Products | Upgrading Software AG Products | Critical Factors and Requirements for Successful Upgrade | Integration Server or Microservices Runtime Requirements | Clustering Requirements
 
Clustering Requirements
In Integration Server, a cluster is defined as multiple Integration Server instances that point to the same ISInternal database component and connect to the same Cache Manager on a Terracotta Server Array. A cluster can include Integration Server installations on different machines, server instances within an Integration Server installation, or both.
This section is intended for use with the rest of the upgrade procedure. You must perform all documented tasks for your products in the order they are written, with the additional tasks or exceptions noted below.
*When you install the new Integration Servers, create a cluster that matches your old cluster. You can install the new Integration Servers in parallel.
*When you install the fixes on the new Integration Servers, you can install the fixes in parallel.
*When you shut down the old products, shut down all cluster nodes.
Configure the cluster as instructed in webMethods Integration Server Clustering Guide.
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